Wild Pokémon by Area (Color Generation)

The distribution of Pokémon in the wild depends on which version you are playing.

Fun with Numbers

Encounter rates are based on a scale from 0/256 (0%) to 255/256 (99.6%). The encounter rates for the ten slots in an area are:

Slots 1–2: 51/256 (19.9%)
Slot 3: 39/256 (15.2%)
Slot 4–6: 25/256 (9.8%)
Slot 7–8: 13/256 (5.1%)
Slot 9: 11/256 (4.3%)
Slot 10: 3/256 (1.2%)

All encounter rates displayed below are rounded.

Route 1

Tile: Grass Encounter Rate: 10%

Red/Green/Blue Versions

	Level	%
Pidgey	3	20%
Rattata	3	20%
Rattata	3	15%
Rattata	2	10%
Pidgey	2	10%
Pidgey	3	10%
Pidgey	3	5%
Rattata	4	5%
Pidgey	4	4%
Pidgey	5	1%

Yellow Version

	Level	%
Pidgey	3	20%
Pidgey	4	20%
Rattata	2	15%
Rattata	3	10%
Pidgey	2	10%
Pidgey	3	10%
Pidgey	5	5%
Rattata	4	5%
Pidgey	6	4%
Pidgey	7	1%

Route 2

Tile: Grass Encounter Rate: 10%

Red Version

	Level	%
Rattata	3	20%
Pidgey	3	20%
Pidgey	4	15%
Rattata	4	10%
Pidgey	5	10%
Weedle	3	10%
Rattata	2	5%
Rattata	5	5%
Weedle	4	4%
Weedle	5	1%

Green/Blue Versions

	Level	%
Rattata	3	20%
Pidgey	3	20%
Pidgey	4	15%
Rattata	4	10%
Pidgey	5	10%
Caterpie	3	10%
Rattata	2	5%
Rattata	5	5%
Caterpie	4	4%
Caterpie	5	1%

Yellow Version

	Level	%
Rattata	3	20%
Pidgey	3	20%
Rattata	4	15%
Nidoran♂	4	10%
Nidoran♀	4	10%
Pidgey	5	10%
Nidoran♂	6	5%
Nidoran♀	6	5%
Pidgey	7	4%
Pidgey	7	1%

Route 22

Tile: Grass Encounter Rate: 10%

Red Version/Blue Version (Japan)

	Level	%
Rattata	3	20%
Nidoran♂	3	20%
Rattata	4	15%
Nidoran♂	4	10%
Rattata	2	10%
Nidoran♂	2	10%
Spearow	3	5%
Spearow	5	5%
Nidoran♀	3	4%
Nidoran♀	4	1%

Green Version (Blue International)

	Level	%
Rattata	3	20%
Nidoran♀	3	20%
Rattata	4	15%
Nidoran♀	4	10%
Rattata	2	10%
Nidoran♀	2	10%
Spearow	3	5%
Spearow	5	5%
Nidoran♂	3	4%
Nidoran♂	4	1%

Yellow Version

	Level	%
Nidoran♂	2	20%
Nidoran♀	2	20%
Mankey	3	15%
Rattata	3	10%
Nidoran♂	4	10%
Nidoran♀	4	10%
Mankey	5	5%
Spearow	2	5%
Spearow	4	4%
Spearow	6	1%

Viridian Forest

Tile: Grass Encounter Rate: 3% (Yellow: 10%)

Red Version

	Level	%
Weedle	4	20%
Kakuna	5	20%
Weedle	3	15%
Weedle	5	10%
Kakuna	4	10%
Kakuna	6	10%
Metapod	4	5%
Caterpie	3	5%
Pikachu	3	4%
Pikachu	5	1%

Green/Blue Versions

	Level	%
Caterpie	4	20%
Metapod	5	20%
Caterpie	3	15%
Caterpie	5	10%
Metapod	4	10%
Metapod	6	10%
Kakuna	4	5%
Weedle	3	5%
Pikachu	3	4%
Pikachu	5	1%

Yellow Version

	Level	%
Caterpie	3	20%
Metapod	4	20%
Caterpie	4	15%
Caterpie	5	10%
Pidgey	4	10%
Pidgey	6	10%
Caterpie	6	5%
Metapod	6	5%
Pidgey	8	4%
Pidgeotto	9	1%

Route 3

Tile: Grass Encounter Rate: 8%

Red/Green/Blue Versions

	Level	%
Pidgey	6	20%
Spearow	5	20%
Pidgey	7	15%
Spearow	6	10%
Spearow	7	10%
Pidgey	8	10%
Spearow	8	5%
Jigglypuff	3	5%
Jigglypuff	5	4%
Jigglypuff	7	1%

Yellow Version

	Level	%
Spearow	8	20%
Spearow	9	20%
Mankey	9	15%
Spearow	10	10%
Sandshrew	8	10%
Rattata	10	10%
Sandshrew	10	5%
Rattata	12	5%
Spearow	11	4%
Spearow	12	1%

Mt. Moon 1F

Tile: Grass Encounter Rate: 4%

Red/Green/Blue Versions

	Level	%
Zubat	8	20%
Zubat	7	20%
Zubat	9	15%
Geodude	8	10%
Zubat	6	10%
Zubat	10	10%
Geodude	10	5%
Paras	8	5%
Zubat	11	4%
Clefairy	8	1%

Yellow Version

	Level	%
Zubat	8	20%
Zubat	9	20%
Geodude	10	15%
Zubat	6	10%
Zubat	7	10%
Zubat	10	10%
Geodude	10	5%
Zubat	11	5%
Sandshrew	12	4%
Clefairy	11	1%

Mt. Moon B1F

Tile: Grass Encounter Rate: 4%

Red/Green/Blue Versions

	Level	%
Zubat	8	20%
Zubat	7	20%
Geodude	7	15%
Geodude	8	10%
Zubat	9	10%
Paras	10	10%
Zubat	10	5%
Zubat	11	5%
Clefairy	9	4%
Geodude	9	1%

Yellow Version

	Level	%
Zubat	8	20%
Zubat	9	20%
Zubat	10	15%
Geodude	10	10%
Geodude	11	10%
Zubat	11	10%
Paras	9	5%
Paras	11	5%
Clefairy	10	4%
Clefairy	12	1%

Mt. Moon B2F

Tile: Grass Encounter Rate: 4%

Red/Green/Blue Versions

	Level	%
Zubat	9	20%
Geodude	9	20%
Zubat	10	15%
Geodude	10	10%
Zubat	11	10%
Paras	10	10%
Paras	12	5%
Clefairy	10	5%
Zubat	12	4%
Clefairy	12	1%

Yellow Version

	Level	%
Zubat	10	20%
Geodude	11	20%
Paras	13	15%
Zubat	11	10%
Zubat	11	10%
Zubat	12	10%
Zubat	13	5%
Clefairy	9	5%
Clefairy	11	4%
Clefairy	13	1%

Route 4

Tile: Grass Encounter Rate: 8%

Red Version

	Level	%
Rattata	10	20%
Spearow	10	20%
Rattata	8	15%
Ekans	6	10%
Spearow	8	10%
Ekans	10	10%
Rattata	12	5%
Spearow	12	5%
Ekans	8	4%
Ekans	12	1%

Green/Blue Versions

	Level	%
Rattata	10	20%
Spearow	10	20%
Rattata	8	15%
Sandshrew	6	10%
Spearow	8	10%
Sandshrew	10	10%
Rattata	12	5%
Spearow	12	5%
Sandshrew	8	4%
Sandshrew	12	1%

Yellow Version

	Level	%
Spearow	8	20%
Spearow	9	20%
Mankey	9	15%
Spearow	10	10%
Sandshrew	8	10%
Rattata	10	10%
Sandshrew	10	5%
Rattata	12	5%
Spearow	11	4%
Spearow	12	1%

Route 24

Tile: Grass Encounter Rate: 10%

Red Version

	Level	%
Weedle	7	20%
Kakuna	8	20%
Pidgey	12	15%
Oddish	12	10%
Oddish	13	10%
Abra	10	10%
Oddish	14	5%
Pidgey	13	5%
Abra	8	4%
Abra	12	1%

Green Version (Blue International)

	Level	%
Caterpie	7	20%
Metapod	8	20%
Pidgey	12	15%
Bellsprout	12	10%
Bellsprout	13	10%
Abra	10	10%
Bellsprout	14	5%
Pidgey	13	5%
Abra	8	4%
Abra	12	1%

Blue Version (Japan)

	Level	%
Caterpie	7	20%
Metapod	8	20%
Pidgey	12	15%
Oddish	12	10%
Oddish	13	10%
Abra	10	10%
Oddish	14	5%
Pidgey	13	5%
Abra	8	4%
Abra	12	1%

Yellow Version

	Level	%
Oddish	12	20%
Bellsprout	12	20%
Pidgey	13	15%
Oddish	14	10%
Bellsprout	14	10%
Pidgey	15	10%
Venonat	13	5%
Venonat	16	5%
Pidgey	17	4%
Pidgeotto	17	1%

Route 25

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Weedle	8	20%
Kakuna	9	20%
Pidgey	13	15%
Oddish	12	10%
Oddish	13	10%
Abra	12	10%
Oddish	14	5%
Abra	10	5%
Metapod	7	4%
Caterpie	8	1%

Green Version (Blue International)

	Level	%
Caterpie	8	20%
Metapod	9	20%
Pidgey	13	15%
Bellsprout	12	10%
Bellsprout	13	10%
Abra	12	10%
Bellsprout	14	5%
Abra	10	5%
Kakuna	7	4%
Weedle	8	1%

Blue Version (Japan)

	Level	%
Caterpie	8	20%
Metapod	9	20%
Pidgey	13	15%
Oddish	12	10%
Oddish	13	10%
Abra	12	10%
Oddish	14	5%
Abra	10	5%
Kakuna	7	4%
Weedle	8	1%

Yellow Version

	Level	%
Oddish	12	20%
Bellsprout	12	20%
Pidgey	13	15%
Oddish	14	10%
Bellsprout	14	10%
Pidgey	15	10%
Venonat	13	5%
Venonat	16	5%
Pidgey	17	4%
Pidgeotto	17	1%

Route 9

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Rattata	16	20%
Spearow	16	20%
Rattata	14	15%
Ekans	11	10%
Spearow	13	10%
Ekans	15	10%
Rattata	17	5%
Spearow	17	5%
Ekans	13	4%
Ekans	17	1%

Green/Blue Versions

	Level	%
Rattata	16	20%
Spearow	16	20%
Rattata	14	15%
Sandshrew	11	10%
Spearow	13	10%
Sandshrew	15	10%
Rattata	17	5%
Spearow	17	5%
Sandshrew	13	4%
Sandshrew	17	1%

Yellow Version

	Level	%
Nidoran♂	16	20%
Nidoran♀	16	20%
Rattata	18	15%
Nidoran♂	18	10%
Nidoran♀	18	10%
Spearow	17	10%
Nidorino	18	5%
Nidorina	18	5%
Raticate	20	4%
Fearow	19	1%

Route 5

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Oddish	13	20%
Pidgey	13	20%
Pidgey	15	15%
Mankey	10	10%
Mankey	12	10%
Oddish	15	10%
Oddish	16	5%
Pidgey	16	5%
Mankey	14	4%
Mankey	16	1%

Green Version (Blue International)

	Level	%
Bellsprout	13	20%
Pidgey	13	20%
Pidgey	15	15%
Meowth	10	10%
Meowth	12	10%
Bellsprout	15	10%
Bellsprout	16	5%
Pidgey	16	5%
Meowth	14	4%
Meowth	16	1%

Blue Version (Japan)

	Level	%
Oddish	13	20%
Pidgey	13	20%
Pidgey	15	15%
Meowth	10	10%
Meowth	12	10%
Oddish	15	10%
Oddish	16	5%
Pidgey	16	5%
Meowth	14	4%
Meowth	16	1%

Yellow Version

	Level	%
Pidgey	15	20%
Rattata	14	20%
Abra	7	15%
Pidgey	16	10%
Rattata	16	10%
Pidgey	17	10%
Pidgeotto	17	5%
Jigglypuff	3	5%
Jigglypuff	5	4%
Jigglypuff	7	1%

Route 6

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Oddish	13	20%
Pidgey	13	20%
Pidgey	15	15%
Mankey	10	10%
Mankey	12	10%
Oddish	15	10%
Oddish	16	5%
Pidgey	16	5%
Mankey	14	4%
Mankey	16	1%

Green Version (Blue International)

	Level	%
Bellsprout	13	20%
Pidgey	13	20%
Pidgey	15	15%
Meowth	10	10%
Meowth	12	10%
Bellsprout	15	10%
Bellsprout	16	5%
Pidgey	16	5%
Meowth	14	4%
Meowth	16	1%

Blue Version (Japan)

	Level	%
Oddish	13	20%
Pidgey	13	20%
Pidgey	15	15%
Meowth	10	10%
Meowth	12	10%
Oddish	15	10%
Oddish	16	5%
Pidgey	16	5%
Meowth	14	4%
Meowth	16	1%

Yellow Version

	Level	%
Pidgey	15	20%
Rattata	14	20%
Abra	7	15%
Pidgey	16	10%
Rattata	16	10%
Pidgey	17	10%
Pidgeotto	17	5%
Jigglypuff	3	5%
Jigglypuff	5	4%
Jigglypuff	7	1%

Tile: Surf Encounter Rate: 2% (Yellow: 1%)

Red/Green/Blue/Yellow Versions

	Level	%
Psyduck	15	20%
Psyduck	15	20%
Psyduck	15	15%
Psyduck	15	10%
Psyduck	15	10%
Psyduck	15	10%
Psyduck	15	5%
Psyduck	15	5%
Golduck	15	4%
Golduck	20	1%

Route 11

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Ekans	14	20%
Spearow	15	20%
Ekans	12	15%
Drowzee	9	10%
Spearow	13	10%
Drowzee	13	10%
Ekans	15	5%
Spearow	17	5%
Drowzee	11	4%
Drowzee	15	1%

Green/Blue Versions

	Level	%
Sandshrew	14	20%
Spearow	15	20%
Sandshrew	12	15%
Drowzee	9	10%
Spearow	13	10%
Drowzee	13	10%
Sandshrew	15	5%
Spearow	17	5%
Drowzee	11	4%
Drowzee	15	1%

Yellow Version

	Level	%
Pidgey	16	20%
Rattata	15	20%
Pidgey	18	15%
Drowzee	15	10%
Rattata	17	10%
Drowzee	17	10%
Pidgeotto	18	5%
Pidgeotto	20	5%
Drowzee	19	4%
Raticate	17	1%

Rock Tunnel 1F

Tile: Grass Encounter Rate: 6%

Red/Green (Blue International) Versions

	Level	%
Zubat	16	20%
Zubat	17	20%
Geodude	17	15%
Machop	15	10%
Geodude	16	10%
Zubat	18	10%
Zubat	15	5%
Machop	17	5%
Onix	13	4%
Onix	15	1%

Blue Version (Japan)

	Level	%
Zubat	16	20%
Zubat	17	20%
Geodude	17	15%
Machop	15	10%
Geodude	16	10%
Ditto	18	10%
Zubat	15	5%
Machop	17	5%
Onix	13	4%
Onix	15	1%

Yellow Version

	Level	%
Zubat	15	20%
Geodude	16	20%
Zubat	17	15%
Zubat	19	10%
Geodude	18	10%
Geodude	20	10%
Zubat	21	5%
Machop	17	5%
Machop	19	4%
Machop	21	1%

Rock Tunnel B1F

Tile: Grass Encounter Rate: 6%

Red/Green (Blue International) Versions

	Level	%
Zubat	16	20%
Zubat	17	20%
Geodude	17	15%
Machop	15	10%
Geodude	16	10%
Zubat	18	10%
Machop	17	5%
Onix	17	5%
Onix	13	4%
Geodude	18	1%

Blue Version (Japan)

	Level	%
Zubat	16	20%
Zubat	17	20%
Geodude	17	15%
Machop	15	10%
Geodude	16	10%
Ditto	18	10%
Machop	17	5%
Onix	17	5%
Onix	13	4%
Geodude	18	1%

Yellow Version

	Level	%
Zubat	20	20%
Geodude	17	20%
Machop	18	15%
Zubat	21	10%
Zubat	22	10%
Geodude	21	10%
Machop	20	5%
Onix	14	5%
Onix	18	4%
Onix	22	1%

Route 10

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Voltorb	16	20%
Spearow	16	20%
Voltorb	14	15%
Ekans	11	10%
Spearow	13	10%
Ekans	15	10%
Voltorb	17	5%
Spearow	17	5%
Ekans	13	4%
Ekans	17	1%

Green/Blue Versions

	Level	%
Voltorb	16	20%
Spearow	16	20%
Voltorb	14	15%
Sandshrew	11	10%
Spearow	13	10%
Sandshrew	15	10%
Voltorb	17	5%
Spearow	17	5%
Sandshrew	13	4%
Sandshrew	17	1%

Yellow Version

	Level	%
Magnemite	16	20%
Rattata	18	20%
Magnemite	18	15%
Magnemite	20	10%
Nidoran♂	17	10%
Nidoran♀	17	10%
Magnemite	22	5%
Raticate	20	5%
Machop	16	4%
Machop	18	1%

Route 12

Tile: Grass Encounter Rate: 6%

Red/Blue (Japan) Versions

	Level	%
Oddish	24	20%
Pidgey	25	20%
Pidgey	23	15%
Venonat	24	10%
Oddish	22	10%
Venonat	26	10%
Oddish	26	5%
Pidgey	27	5%
Gloom	28	4%
Gloom	30	1%

Green Version (Blue International)

	Level	%
Bellsprout	24	20%
Pidgey	25	20%
Pidgey	23	15%
Venonat	24	10%
Bellsprout	22	10%
Venonat	26	10%
Bellsprout	26	5%
Pidgey	27	5%
Weepinbell	28	4%
Weepinbell	30	1%

Yellow Version

	Level	%
Oddish	25	20%
Bellsprout	25	20%
Pidgey	28	15%
Pidgeotto	28	10%
Oddish	27	10%
Bellsprout	27	10%
Gloom	29	5%
Weepinbell	29	5%
Farfetch'd	26	4%
Farfetch'd	31	1%

Tile: Surf Encounter Rate: 2% (Yellow: 1%)

Red/Green/Blue Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Yellow Version

	Level	%
Slowpoke	15	20%
Slowpoke	15	20%
Slowpoke	15	15%
Slowpoke	15	10%
Slowpoke	15	10%
Slowpoke	15	10%
Slowpoke	15	5%
Slowpoke	15	5%
Slowbro	15	4%
Slowbro	20	1%

Route 8

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Pidgey	18	20%
Mankey	18	20%
Ekans	17	15%
Growlithe	16	10%
Pidgey	20	10%
Mankey	20	10%
Ekans	19	5%
Growlithe	17	5%
Growlithe	15	4%
Growlithe	18	1%

Green Version (Blue International)

	Level	%
Pidgey	18	20%
Meowth	18	20%
Sandshrew	17	15%
Vulpix	16	10%
Pidgey	20	10%
Meowth	20	10%
Sandshrew	19	5%
Vulpix	17	5%
Vulpix	15	4%
Vulpix	18	1%

Blue Version (Japan)

	Level	%
Pidgey	18	20%
Meowth	18	20%
Sandshrew	17	15%
Growlithe	16	10%
Pidgey	20	10%
Meowth	20	10%
Sandshrew	19	5%
Growlithe	17	5%
Growlithe	15	4%
Growlithe	18	1%

Yellow Version

	Level	%
Pidgey	20	20%
Pidgey	22	20%
Rattata	20	15%
Abra	15	10%
Abra	19	10%
Pidgeotto	24	10%
Jigglypuff	19	5%
Jigglypuff	24	5%
Kadabra	20	4%
Kadabra	27	1%

Route 7

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Pidgey	19	20%
Oddish	19	20%
Mankey	17	15%
Oddish	22	10%
Pidgey	22	10%
Mankey	18	10%
Growlithe	18	5%
Growlithe	20	5%
Mankey	19	4%
Mankey	20	1%

Green Version (Blue International)

	Level	%
Pidgey	19	20%
Bellsprout	19	20%
Meowth	17	15%
Bellsprout	22	10%
Pidgey	22	10%
Meowth	18	10%
Vulpix	18	5%
Vulpix	20	5%
Meowth	19	4%
Meowth	20	1%

Blue Version (Japan)

	Level	%
Pidgey	19	20%
Oddish	19	20%
Meowth	17	15%
Oddish	22	10%
Pidgey	22	10%
Meowth	18	10%
Growlithe	18	5%
Growlithe	20	5%
Meowth	19	4%
Meowth	20	1%

Yellow Version

	Level	%
Pidgey	20	20%
Pidgey	22	20%
Rattata	20	15%
Abra	15	10%
Abra	19	10%
Pidgeotto	24	10%
Abra	26	5%
Jigglypuff	19	5%
Jigglypuff	24	4%
Jigglypuff	24	1%

Pokémon Tower 3F

Tile: Grass Encounter Rate: 4%

Red/Green/Blue Versions

	Level	%
Gastly	20	20%
Gastly	21	20%
Gastly	22	15%
Gastly	23	10%
Gastly	19	10%
Gastly	18	10%
Gastly	24	5%
Cubone	20	5%
Cubone	22	4%
Haunter	25	1%

Yellow Version

	Level	%
Gastly	20	20%
Gastly	21	20%
Gastly	22	15%
Gastly	23	10%
Gastly	24	10%
Gastly	19	10%
Gastly	18	5%
Gastly	25	5%
Haunter	20	4%
Haunter	25	1%

Pokémon Tower 4F

Tile: Grass Encounter Rate: 4%

Red/Green/Blue Versions

	Level	%
Gastly	20	20%
Gastly	21	20%
Gastly	22	15%
Gastly	23	10%
Gastly	19	10%
Gastly	18	10%
Haunter	25	5%
Cubone	20	5%
Cubone	22	4%
Gastly	24	1%

Yellow Version

	Level	%
Gastly	20	20%
Gastly	21	20%
Gastly	22	15%
Gastly	23	10%
Gastly	24	10%
Gastly	19	10%
Gastly	18	5%
Gastly	25	5%
Haunter	20	4%
Haunter	25	1%

Pokémon Tower 5F

Tile: Grass Encounter Rate: 4% (Yellow: 6%)

Red/Green/Blue Versions

	Level	%
Gastly	20	20%
Gastly	21	20%
Gastly	22	15%
Gastly	23	10%
Gastly	19	10%
Gastly	18	10%
Haunter	25	5%
Cubone	20	5%
Cubone	22	4%
Gastly	24	1%

Yellow Version

	Level	%
Gastly	22	20%
Gastly	23	20%
Gastly	24	15%
Gastly	25	10%
Gastly	26	10%
Gastly	21	10%
Cubone	20	5%
Gastly	27	5%
Haunter	22	4%
Haunter	27	1%

Pokémon Tower 6F

Tile: Grass Encounter Rate: 6%

Red/Green/Blue Versions

	Level	%
Gastly	21	20%
Gastly	22	20%
Gastly	23	15%
Gastly	24	10%
Gastly	20	10%
Gastly	19	10%
Haunter	26	5%
Cubone	22	5%
Cubone	24	4%
Haunter	28	1%

Yellow Version

	Level	%
Gastly	22	20%
Gastly	23	20%
Gastly	24	15%
Gastly	25	10%
Gastly	26	10%
Gastly	21	10%
Cubone	22	5%
Gastly	27	5%
Haunter	22	4%
Haunter	27	1%

Pokémon Tower 7F

Tile: Grass Encounter Rate: 6% (Yellow: 8%)

Red/Green/Blue Versions

	Level	%
Gastly	21	20%
Gastly	22	20%
Gastly	23	15%
Gastly	24	10%
Gastly	20	10%
Haunter	28	10%
Cubone	22	5%
Cubone	24	5%
Haunter	28	4%
Haunter	30	1%

Yellow Version

	Level	%
Gastly	24	20%
Gastly	25	20%
Gastly	26	15%
Gastly	27	10%
Gastly	28	10%
Gastly	23	10%
Cubone	24	5%
Gastly	29	5%
Haunter	24	4%
Haunter	29	1%

Route 13

Tile: Grass Encounter Rate: 8% (Yellow: 6%)

Red/Blue (Japan) Versions

	Level	%
Oddish	24	20%
Pidgey	25	20%
Pidgey	27	15%
Venonat	24	10%
Oddish	22	10%
Venonat	26	10%
Oddish	26	5%
Ditto	25	5%
Gloom	28	4%
Gloom	30	1%

Green Version (Blue International)

	Level	%
Bellsprout	24	20%
Pidgey	25	20%
Pidgey	27	15%
Venonat	24	10%
Bellsprout	22	10%
Venonat	26	10%
Bellsprout	26	5%
Ditto	25	5%
Weepinbell	28	4%
Weepinbell	30	1%

Yellow Version

	Level	%
Oddish	25	20%
Bellsprout	25	20%
Pidgeotto	28	15%
Pidgey	28	10%
Oddish	27	10%
Bellsprout	27	10%
Gloom	29	5%
Weepinbell	29	5%
Farfetch'd	26	4%
Farfetch'd	31	1%

Tile: Surf Encounter Rate: 2% (Yellow: 1%)

Red/Green/Blue Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Yellow Version

	Level	%
Slowpoke	15	20%
Slowpoke	15	20%
Slowpoke	15	15%
Slowpoke	15	10%
Slowpoke	15	10%
Slowpoke	15	10%
Slowpoke	15	5%
Slowpoke	15	5%
Slowbro	15	4%
Slowbro	20	1%

Route 14

Tile: Grass Encounter Rate: 6%

Red/Blue (Japan) Versions

	Level	%
Oddish	24	20%
Pidgey	26	20%
Ditto	23	15%
Venonat	24	10%
Oddish	22	10%
Venonat	26	10%
Oddish	26	5%
Gloom	30	5%
Pidgeotto	28	4%
Pidgeotto	30	1%

Green Version (Blue International)

	Level	%
Bellsprout	24	20%
Pidgey	26	20%
Ditto	23	15%
Venonat	24	10%
Bellsprout	22	10%
Venonat	26	10%
Bellsprout	26	5%
Weepinbell	30	5%
Pidgeotto	28	4%
Pidgeotto	30	1%

Yellow Version

	Level	%
Oddish	26	20%
Bellsprout	26	20%
Venonat	24	15%
Pidgeotto	30	10%
Oddish	28	10%
Bellsprout	28	10%
Gloom	30	5%
Weepinbell	30	5%
Venonat	27	4%
Venomoth	30	1%

Route 15

Tile: Grass Encounter Rate: 6%

Red/Blue (Japan) Versions

	Level	%
Oddish	24	20%
Ditto	26	20%
Pidgey	23	15%
Venonat	26	10%
Oddish	22	10%
Venonat	28	10%
Oddish	26	5%
Gloom	30	5%
Pidgeotto	28	4%
Pidgeotto	30	1%

Green Version (Blue International)

	Level	%
Bellsprout	24	20%
Ditto	26	20%
Pidgey	23	15%
Venonat	26	10%
Bellsprout	22	10%
Venonat	28	10%
Bellsprout	26	5%
Weepinbell	30	5%
Pidgeotto	28	4%
Pidgeotto	30	1%

Yellow Version

	Level	%
Oddish	26	20%
Bellsprout	26	20%
Venonat	24	15%
Pidgeotto	32	10%
Oddish	28	10%
Bellsprout	28	10%
Gloom	30	5%
Weepinbell	30	5%
Venonat	27	4%
Venomoth	30	1%

Route 16

Tile: Grass Encounter Rate: 10%

Red/Green/Blue Versions

	Level	%
Spearow	20	20%
Spearow	22	20%
Rattata	18	15%
Doduo	20	10%
Rattata	20	10%
Doduo	18	10%
Doduo	22	5%
Rattata	22	5%
Raticate	23	4%
Raticate	25	1%

Yellow Version

	Level	%
Spearow	22	20%
Doduo	22	20%
Rattata	23	15%
Doduo	24	10%
Rattata	24	10%
Doduo	26	10%
Spearow	23	5%
Fearow	24	5%
Raticate	25	4%
Raticate	26	1%

Route 17

Tile: Grass Encounter Rate: 10%

Red/Green/Blue Versions

	Level	%
Spearow	20	20%
Spearow	22	20%
Raticate	25	15%
Doduo	24	10%
Raticate	27	10%
Doduo	26	10%
Doduo	28	5%
Raticate	29	5%
Fearow	25	4%
Fearow	27	1%

Yellow Version

	Level	%
Doduo	26	20%
Fearow	27	20%
Doduo	27	15%
Doduo	28	10%
Ponyta	28	10%
Ponyta	30	10%
Fearow	29	5%
Doduo	28	5%
Ponyta	32	4%
Dodrio	29	1%

Route 18

Tile: Grass Encounter Rate: 10%

Red/Green/Blue Versions

	Level	%
Spearow	20	20%
Spearow	22	20%
Raticate	25	15%
Doduo	24	10%
Fearow	25	10%
Doduo	26	10%
Doduo	28	5%
Raticate	29	5%
Fearow	27	4%
Fearow	29	1%

Yellow Version

	Level	%
Spearow	22	20%
Doduo	22	20%
Rattata	23	15%
Doduo	24	10%
Rattata	24	10%
Doduo	26	10%
Spearow	23	5%
Fearow	24	5%
Raticate	25	4%
Raticate	26	1%

Safari Zone Center

Tile: Grass Encounter Rate: 12%

Red/Blue (Japan) Versions

	Level	%
Nidoran♂	22	20%
Rhyhorn	25	20%
Venonat	22	15%
Exeggcute	24	10%
Nidorino	31	10%
Exeggcute	25	10%
Nidorina	31	5%
Parasect	30	5%
Scyther	23	4%
Chansey	23	1%

Green Version (Blue International)

	Level	%
Nidoran♀	22	20%
Rhyhorn	25	20%
Venonat	22	15%
Exeggcute	24	10%
Nidorina	31	10%
Exeggcute	25	10%
Nidorino	31	5%
Parasect	30	5%
Pinsir	23	4%
Chansey	23	1%

Yellow Version

	Level	%
Nidoran♂	14	20%
Nidoran♀	36	20%
Exeggcute	24	15%
Rhyhorn	20	10%
Nidorino	23	10%
Parasect	27	10%
Paras	27	5%
Parasect	32	5%
Tangela	22	4%
Chansey	7	1%

Safari Zone East

Tile: Grass Encounter Rate: 12%

Red Version

	Level	%
Nidoran♂	24	20%
Doduo	26	20%
Paras	22	15%
Exeggcute	25	10%
Nidorino	33	10%
Exeggcute	23	10%
Nidoran♀	24	5%
Parasect	25	5%
Kangaskhan	25	4%
Scyther	28	1%

Green Version (Blue International)

	Level	%
Nidoran♀	24	20%
Doduo	26	20%
Paras	22	15%
Exeggcute	25	10%
Nidorina	33	10%
Exeggcute	23	10%
Nidoran♂	24	5%
Parasect	25	5%
Kangaskhan	25	4%
Pinsir	28	1%

Blue Version (Japan)

	Level	%
Nidoran♂	24	20%
Doduo	26	20%
Paras	22	15%
Exeggcute	25	10%
Nidorino	33	10%
Exeggcute	23	10%
Nidoran♀	24	5%
Parasect	25	5%
Lickitung	25	4%
Scyther	28	1%

Yellow Version

	Level	%
Nidoran♂	21	20%
Nidoran♀	29	20%
Exeggcute	22	15%
Tauros	21	10%
Nidorina	32	10%
Cubone	19	10%
Exeggcute	26	5%
Marowak	24	5%
Chansey	21	4%
Scyther	15	1%

Safari Zone North

Tile: Grass Encounter Rate: 12%

Red Version

	Level	%
Nidoran♂	22	20%
Rhyhorn	26	20%
Paras	23	15%
Exeggcute	25	10%
Nidorino	30	10%
Exeggcute	27	10%
Nidorina	30	5%
Venomoth	32	5%
Chansey	26	4%
Tauros	28	1%

Green Version (Blue International)

	Level	%
Nidoran♀	22	20%
Rhyhorn	26	20%
Paras	23	15%
Exeggcute	25	10%
Nidorina	30	10%
Exeggcute	27	10%
Nidorino	30	5%
Venomoth	32	5%
Chansey	26	4%
Tauros	28	1%

Blue Version (Japan)

	Level	%
Nidoran♂	22	20%
Rhyhorn	26	20%
Paras	23	15%
Exeggcute	25	10%
Nidorino	30	10%
Exeggcute	27	10%
Nidorina	30	5%
Venomoth	32	5%
Chansey	26	4%
Pinsir	28	1%

Yellow Version

	Level	%
Nidoran♂	36	20%
Nidoran♀	14	20%
Exeggcute	20	15%
Rhyhorn	25	10%
Nidorina	23	10%
Kangaskhan	28	10%
Cubone	16	5%
Kangaskhan	33	5%
Scyther	25	4%
Pinsir	15	1%

Safari Zone West

Tile: Grass Encounter Rate: 12%

Red Version

	Level	%
Nidoran♂	25	20%
Doduo	26	20%
Venonat	23	15%
Exeggcute	24	10%
Nidorino	33	10%
Exeggcute	26	10%
Nidoran♀	25	5%
Venomoth	31	5%
Tauros	26	4%
Kangaskhan	28	1%

Green Version (Blue International)

	Level	%
Nidoran♀	25	20%
Doduo	26	20%
Venonat	23	15%
Exeggcute	24	10%
Nidorina	33	10%
Exeggcute	26	10%
Nidoran♂	25	5%
Venomoth	31	5%
Tauros	26	4%
Kangaskhan	28	1%

Blue Version (Japan)

	Level	%
Nidoran♂	25	20%
Doduo	26	20%
Venonat	23	15%
Exeggcute	24	10%
Nidorino	33	10%
Exeggcute	26	10%
Nidoran♀	25	5%
Venomoth	31	5%
Pinsir	26	4%
Lickitung	28	1%

Yellow Version

	Level	%
Nidoran♂	29	20%
Nidoran♀	21	20%
Exeggcute	22	15%
Tauros	21	10%
Nidorino	32	10%
Cubone	19	10%
Exeggcute	26	5%
Marowak	24	5%
Pinsir	25	4%
Tangela	27	1%

Route 19

Tile: Surf Encounter Rate: 2%

Red/Green/Blue/Yellow Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Route 20

Tile: Surf Encounter Rate: 2%

Red/Green/Blue/Yellow Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Seafoam Islands 1F

Tile: Grass Encounter Rate: 6%

Red Version

	Level	%
Seel	30	20%
Slowpoke	30	20%
Shellder	30	15%
Horsea	30	10%
Horsea	28	10%
Zubat	21	10%
Golbat	29	5%
Psyduck	28	5%
Shellder	28	4%
Golduck	38	1%

Green Version (Blue International)

	Level	%
Seel	30	20%
Psyduck	30	20%
Staryu	30	15%
Krabby	30	10%
Krabby	28	10%
Zubat	21	10%
Golbat	29	5%
Slowpoke	28	5%
Staryu	28	4%
Slowbro	38	1%

Blue Version (Japan)

	Level	%
Seel	30	20%
Horsea	30	20%
Staryu	30	15%
Krabby	30	10%
Krabby	28	10%
Zubat	21	10%
Golbat	29	5%
Slowpoke	28	5%
Staryu	28	4%
Slowbro	38	1%

Yellow Version

	Level	%
Zubat	18	20%
Krabby	25	20%
Krabby	27	15%
Zubat	27	10%
Zubat	36	10%
Slowpoke	28	10%
Slowpoke	30	5%
Zubat	9	5%
Golbat	27	4%
Golbat	36	1%

Seafoam Islands B1F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Staryu	30	20%
Horsea	30	20%
Shellder	32	15%
Horsea	32	10%
Slowpoke	28	10%
Seel	30	10%
Slowpoke	30	5%
Seel	28	5%
Dewgong	38	4%
Seadra	37	1%

Green Version (Blue International)

	Level	%
Shellder	30	20%
Krabby	30	20%
Staryu	32	15%
Krabby	32	10%
Psyduck	28	10%
Seel	30	10%
Psyduck	30	5%
Seel	28	5%
Dewgong	38	4%
Kingler	37	1%

Blue Version (Japan)

	Level	%
Shellder	30	20%
Krabby	30	20%
Staryu	32	15%
Krabby	32	10%
Horsea	28	10%
Seel	30	10%
Horsea	30	5%
Seel	28	5%
Dewgong	38	4%
Kingler	37	1%

Yellow Version

	Level	%
Zubat	27	20%
Krabby	26	20%
Zubat	36	15%
Krabby	28	10%
Golbat	27	10%
Slowpoke	29	10%
Zubat	18	5%
Kingler	28	5%
Seel	22	4%
Seel	26	1%

Seafoam Islands B2F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Seel	30	20%
Slowpoke	30	20%
Seel	32	15%
Slowpoke	32	10%
Horsea	28	10%
Staryu	30	10%
Horsea	30	5%
Shellder	28	5%
Golbat	30	4%
Slowbro	37	1%

Green Version (Blue International)

	Level	%
Seel	30	20%
Psyduck	30	20%
Seel	32	15%
Psyduck	32	10%
Krabby	28	10%
Shellder	30	10%
Krabby	30	5%
Staryu	28	5%
Golbat	30	4%
Golduck	37	1%

Blue Version (Japan)

	Level	%
Seel	30	20%
Horsea	30	20%
Seel	32	15%
Horsea	32	10%
Krabby	28	10%
Shellder	30	10%
Krabby	30	5%
Staryu	28	5%
Golbat	30	4%
Jynx	37	1%

Yellow Version

	Level	%
Zubat	27	20%
Krabby	27	20%
Zubat	36	15%
Golbat	27	10%
Kingler	28	10%
Seel	24	10%
Krabby	29	5%
Golbat	36	5%
Slowpoke	31	4%
Slowbro	31	1%

Seafoam Islands B3F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Slowpoke	31	20%
Seel	31	20%
Slowpoke	33	15%
Seel	33	10%
Horsea	29	10%
Shellder	31	10%
Horsea	31	5%
Shellder	29	5%
Seadra	39	4%
Dewgong	37	1%

Green Version (Blue International)

	Level	%
Psyduck	31	20%
Seel	31	20%
Psyduck	33	15%
Seel	33	10%
Krabby	29	10%
Staryu	31	10%
Krabby	31	5%
Staryu	29	5%
Kingler	39	4%
Dewgong	37	1%

Blue Version (Japan)

	Level	%
Horsea	31	20%
Seel	31	20%
Horsea	33	15%
Seel	33	10%
Krabby	29	10%
Staryu	31	10%
Krabby	31	5%
Staryu	29	5%
Kingler	39	4%
Dewgong	37	1%

Yellow Version

	Level	%
Golbat	27	20%
Zubat	36	20%
Krabby	29	15%
Zubat	27	10%
Kingler	30	10%
Seel	26	10%
Krabby	31	5%
Seel	30	5%
Dewgong	28	4%
Dewgong	32	1%

Tile: Surf Encounter Rate: 2%

Red/Green/Blue Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Yellow Version

	Level	%
Tentacool	25	20%
Tentacool	30	20%
Tentacool	20	15%
Staryu	30	10%
Tentacool	35	10%
Staryu	30	10%
Tentacool	40	5%
Staryu	30	5%
Staryu	30	4%
Staryu	30	1%

Seafoam Islands B4F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Horsea	31	20%
Shellder	31	20%
Horsea	33	15%
Shellder	33	10%
Slowpoke	29	10%
Seel	31	10%
Slowpoke	31	5%
Seel	29	5%
Slowbro	39	4%
Golbat	32	1%

Green Version (Blue International)

	Level	%
Krabby	31	20%
Staryu	31	20%
Krabby	33	15%
Staryu	33	10%
Psyduck	29	10%
Seel	31	10%
Psyduck	31	5%
Seel	29	5%
Golduck	39	4%
Golbat	32	1%

Blue Version (Japan)

	Level	%
Krabby	31	20%
Staryu	31	20%
Krabby	33	15%
Staryu	33	10%
Horsea	29	10%
Seel	31	10%
Horsea	31	5%
Seel	29	5%
Jynx	39	4%
Golbat	32	1%

Yellow Version

	Level	%
Golbat	36	20%
Zubat	36	20%
Krabby	30	15%
Kingler	32	10%
Seel	28	10%
Seel	32	10%
Golbat	27	5%
Zubat	45	5%
Dewgong	30	4%
Dewgong	34	1%

Tile: Surf Encounter Rate: 2%

Red/Green/Blue Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Yellow Version

	Level	%
Tentacool	25	20%
Tentacool	30	20%
Tentacool	20	15%
Staryu	30	10%
Tentacool	35	10%
Staryu	30	10%
Tentacool	40	5%
Staryu	30	5%
Staryu	30	4%
Staryu	30	1%

Pokémon Mansion 1F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Koffing	32	20%
Koffing	30	20%
Ponyta	34	15%
Ponyta	30	10%
Growlithe	34	10%
Ponyta	32	10%
Grimer	30	5%
Ponyta	28	5%
Weezing	37	4%
Muk	39	1%

Green Version (Blue International)

	Level	%
Grimer	32	20%
Grimer	30	20%
Ponyta	34	15%
Ponyta	30	10%
Vulpix	34	10%
Ponyta	32	10%
Koffing	30	5%
Ponyta	28	5%
Muk	37	4%
Weezing	39	1%

Blue Version (Japan)

	Level	%
Grimer	32	20%
Grimer	30	20%
Ponyta	34	15%
Ponyta	30	10%
Growlithe	34	10%
Ponyta	32	10%
Koffing	30	5%
Ponyta	28	5%
Muk	37	4%
Weezing	39	1%

Yellow Version

	Level	%
Rattata	34	20%
Raticate	34	20%
Grimer	23	15%
Growlithe	26	10%
Rattata	37	10%
Raticate	37	10%
Growlithe	30	5%
Grimer	26	5%
Growlithe	34	4%
Growlithe	38	1%

Pokémon Mansion 2F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Growlithe	32	20%
Koffing	34	20%
Koffing	34	15%
Ponyta	30	10%
Koffing	30	10%
Ponyta	32	10%
Grimer	30	5%
Ponyta	28	5%
Weezing	39	4%
Muk	37	1%

Green Version (Blue International)

	Level	%
Vulpix	32	20%
Grimer	34	20%
Grimer	34	15%
Ponyta	30	10%
Grimer	30	10%
Ponyta	32	10%
Koffing	30	5%
Ponyta	28	5%
Muk	39	4%
Weezing	37	1%

Blue Version (Japan)

	Level	%
Growlithe	32	20%
Grimer	34	20%
Grimer	34	15%
Ponyta	30	10%
Grimer	30	10%
Ponyta	32	10%
Koffing	30	5%
Ponyta	28	5%
Muk	39	4%
Weezing	37	1%

Yellow Version

	Level	%
Rattata	37	20%
Raticate	37	20%
Grimer	26	15%
Grimer	29	10%
Rattata	40	10%
Raticate	40	10%
Grimer	32	5%
Grimer	35	5%
Muk	35	4%
Muk	38	1%

Pokémon Mansion 3F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Koffing	31	20%
Growlithe	33	20%
Koffing	35	15%
Ponyta	32	10%
Ponyta	34	10%
Weezing	40	10%
Grimer	34	5%
Weezing	38	5%
Ponyta	36	4%
Muk	42	1%

Green Version (Blue International)

	Level	%
Grimer	31	20%
Vulpix	33	20%
Grimer	35	15%
Ponyta	32	10%
Magmar	34	10%
Muk	40	10%
Koffing	34	5%
Muk	38	5%
Ponyta	36	4%
Weezing	42	1%

Blue Version (Japan)

	Level	%
Grimer	31	20%
Growlithe	33	20%
Grimer	35	15%
Ponyta	32	10%
Ponyta	34	10%
Muk	40	10%
Koffing	34	5%
Muk	38	5%
Ponyta	36	4%
Weezing	42	1%

Yellow Version

	Level	%
Rattata	40	20%
Raticate	40	20%
Grimer	32	15%
Grimer	35	10%
Rattata	43	10%
Raticate	43	10%
Grimer	38	5%
Grimer	38	5%
Muk	38	4%
Muk	41	1%

Pokémon Mansion B1F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Koffing	33	20%
Koffing	31	20%
Growlithe	35	15%
Ponyta	32	10%
Koffing	31	10%
Weezing	40	10%
Ponyta	34	5%
Grimer	35	5%
Weezing	42	4%
Muk	42	1%

Green Version (Blue International)

	Level	%
Grimer	33	20%
Grimer	31	20%
Vulpix	35	15%
Ponyta	32	10%
Grimer	31	10%
Muk	40	10%
Ponyta	34	5%
Koffing	35	5%
Magmar	38	4%
Weezing	42	1%

Blue Version (Japan)

	Level	%
Grimer	33	20%
Grimer	31	20%
Growlithe	35	15%
Ponyta	32	10%
Grimer	31	10%
Muk	40	10%
Ponyta	34	5%
Koffing	35	5%
Muk	38	4%
Weezing	42	1%

Yellow Version

	Level	%
Grimer	35	20%
Grimer	38	20%
Raticate	37	15%
Raticate	40	10%
Muk	41	10%
Raticate	43	10%
Ditto	24	5%
Raticate	46	5%
Ditto	18	4%
Ditto	12	1%

Route 21

Tile: Grass Encounter Rate: 10%

Red/Green/Blue Versions

	Level	%
Rattata	21	20%
Pidgey	23	20%
Raticate	30	15%
Rattata	23	10%
Pidgey	21	10%
Pidgeotto	30	10%
Pidgeotto	32	5%
Tangela	28	5%
Tangela	30	4%
Tangela	32	1%

Yellow Version

	Level	%
Pidgey	15	20%
Rattata	13	20%
Pidgey	13	15%
Pidgey	11	10%
Pidgey	17	10%
Rattata	15	10%
Raticate	15	5%
Pidgeotto	17	5%
Pidgeotto	19	4%
Pidgeotto	15	1%

Tile: Surf Encounter Rate: 2%

Red/Green/Blue/Yellow Versions

	Level	%
Tentacool	5	20%
Tentacool	10	20%
Tentacool	15	15%
Tentacool	5	10%
Tentacool	10	10%
Tentacool	15	10%
Tentacool	20	5%
Tentacool	30	5%
Tentacool	35	4%
Tentacool	40	1%

Cerulean Cave 1F

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Golbat	46	20%
Hypno	46	20%
Magneton	46	15%
Dodrio	49	10%
Venomoth	49	10%
Arbok	52	10%
Kadabra	49	5%
Parasect	52	5%
Raichu	53	4%
Ditto	53	1%

Green Version (Blue International)

	Level	%
Golbat	46	20%
Hypno	46	20%
Magneton	46	15%
Dodrio	49	10%
Venomoth	49	10%
Sandslash	52	10%
Kadabra	49	5%
Parasect	52	5%
Raichu	53	4%
Ditto	53	1%

Blue Version (Japan)

	Level	%
Golbat	46	20%
Hypno	46	20%
Magneton	46	15%
Rapidash	49	10%
Venomoth	49	10%
Sandslash	52	10%
Kadabra	49	5%
Parasect	52	5%
Raichu	53	4%
Ditto	53	1%

Yellow Version

	Level	%
Golbat	50	20%
Golbat	55	20%
Graveler	45	15%
Gloom	55	10%
Weepinbell	55	10%
Sandslash	52	10%
Venomoth	54	5%
Parasect	54	5%
Ditto	55	4%
Ditto	60	1%

Cerulean Cave 2F

Tile: Grass Encounter Rate: 6%

Red/Green (Blue International) Versions

	Level	%
Dodrio	51	20%
Venomoth	51	20%
Kadabra	51	15%
Rhydon	52	10%
Marowak	52	10%
Electrode	52	10%
Chansey	56	5%
Wigglytuff	54	5%
Ditto	55	4%
Ditto	60	1%

Blue Version (Japan)

	Level	%
Dodrio	51	20%
Venomoth	51	20%
Kadabra	51	15%
Rhydon	52	10%
Raticate	52	10%
Electrode	52	10%
Chansey	56	5%
Wigglytuff	54	5%
Ditto	55	4%
Ditto	60	1%

Yellow Version

	Level	%
Golbat	52	20%
Golbat	57	20%
Graveler	50	15%
Sandslash	56	10%
Rhyhorn	50	10%
Ditto	60	10%
Gloom	58	5%
Weepinbell	58	5%
Rhydon	60	4%
Rhydon	58	1%

Cerulean Cave B1F

Tile: Grass Encounter Rate: 10%

Red Version

	Level	%
Rhydon	55	20%
Marowak	55	20%
Electrode	55	15%
Chansey	64	10%
Parasect	64	10%
Raichu	64	10%
Arbok	57	5%
Ditto	65	5%
Ditto	63	4%
Ditto	67	1%

Green Version (Blue International)

	Level	%
Rhydon	55	20%
Marowak	55	20%
Electrode	55	15%
Chansey	64	10%
Parasect	64	10%
Raichu	64	10%
Sandslash	57	5%
Ditto	65	5%
Ditto	63	4%
Ditto	67	1%

Blue Version (Japan)

	Level	%
Rhydon	55	20%
Marowak	55	20%
Electrode	55	15%
Clefairy	64	10%
Parasect	64	10%
Raichu	64	10%
Sandslash	57	5%
Ditto	65	5%
Ditto	63	4%
Ditto	67	1%

Yellow Version

	Level	%
Golbat	54	20%
Golbat	59	20%
Graveler	55	15%
Rhyhorn	52	10%
Rhydon	62	10%
Ditto	60	10%
Chansey	56	5%
Ditto	65	5%
Lickitung	55	4%
Lickitung	50	1%

Power Plant

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Voltorb	21	20%
Magnemite	21	20%
Pikachu	20	15%
Pikachu	24	10%
Magnemite	23	10%
Voltorb	23	10%
Magneton	32	5%
Magneton	35	5%
Electabuzz	33	4%
Electabuzz	36	1%

Green/Blue Versions

	Level	%
Voltorb	21	20%
Magnemite	21	20%
Pikachu	20	15%
Pikachu	24	10%
Magnemite	23	10%
Voltorb	23	10%
Magneton	32	5%
Magneton	35	5%
Raichu	33	4%
Raichu	36	1%

Yellow Version

	Level	%
Magnemite	30	20%
Magnemite	35	20%
Magneton	33	15%
Voltorb	33	10%
Voltorb	37	10%
Grimer	33	10%
Grimer	37	5%
Magneton	38	5%
Muk	33	4%
Muk	37	1%

Route 23

Tile: Grass Encounter Rate: 4%

Red Version

	Level	%
Ekans	26	20%
Ditto	33	20%
Spearow	26	15%
Fearow	38	10%
Ditto	38	10%
Fearow	38	10%
Arbok	41	5%
Ditto	43	5%
Fearow	41	4%
Fearow	43	1%

Green/Blue Versions

	Level	%
Sandshrew	26	20%
Ditto	33	20%
Spearow	26	15%
Fearow	38	10%
Ditto	38	10%
Fearow	38	10%
Sandslash	41	5%
Ditto	43	5%
Fearow	41	4%
Fearow	43	1%

Yellow Version

	Level	%
Nidorino	41	20%
Nidorina	41	20%
Mankey	36	15%
Nidorino	44	10%
Nidorina	44	10%
Fearow	40	10%
Mankey	41	5%
Fearow	45	5%
Primeape	41	4%
Primeape	46	1%

Victory Road 2F

Tile: Grass Encounter Rate: 4%

Red/Green/Blue Versions

	Level	%
Machop	22	20%
Geodude	24	20%
Zubat	26	15%
Onix	36	10%
Onix	39	10%
Onix	42	10%
Machoke	41	5%
Golbat	40	5%
Marowak	40	4%
Graveler	43	1%

Yellow Version

	Level	%
Geodude	31	20%
Geodude	36	20%
Geodude	41	15%
Zubat	44	10%
Golbat	39	10%
Graveler	44	10%
Onix	45	5%
Onix	47	5%
Machoke	39	4%
Machoke	42	1%

Victory Road 3F

Tile: Grass Encounter Rate: 6%

Red/Green/Blue Versions

	Level	%
Machop	24	20%
Geodude	26	20%
Zubat	22	15%
Onix	42	10%
Venomoth	40	10%
Onix	45	10%
Graveler	43	5%
Golbat	41	5%
Machoke	42	4%
Machoke	45	1%

Yellow Version

	Level	%
Geodude	36	20%
Golbat	44	20%
Geodude	41	15%
Onix	49	10%
Geodude	46	10%
Graveler	41	10%
Machoke	42	5%
Machoke	45	5%
Graveler	47	4%
Graveler	47	1%

Victory Road 1F

Tile: Grass Encounter Rate: 6%

Red/Green/Blue Versions

	Level	%
Machop	24	20%
Geodude	26	20%
Zubat	22	15%
Onix	36	10%
Onix	39	10%
Onix	42	10%
Graveler	41	5%
Golbat	41	5%
Machoke	42	4%
Marowak	43	1%

Yellow Version

	Level	%
Geodude	26	20%
Geodude	31	20%
Geodude	36	15%
Zubat	39	10%
Zubat	44	10%
Geodude	41	10%
Onix	43	5%
Onix	45	5%
Graveler	41	4%
Graveler	47	1%

Diglett's Cave

Tile: Grass Encounter Rate: 8%

Red/Green/Blue/Yellow Versions

	Level	%
Diglett	18	20%
Diglett	19	20%
Diglett	17	15%
Diglett	20	10%
Diglett	16	10%
Diglett	15	10%
Diglett	21	5%
Diglett	22	5%
Dugtrio	29	4%
Dugtrio	31	1%