Number	Name	Catch/Obtain
001	Bulbasaur	Gift from Cerulean City. Rare spawn at Viridian Forest.
002	Ivysaur	Evolves from Bulbasaur at Level 16.
003	Venusaur	Evolves from Ivysaur at Level 32.
004	Charmander	Gift from Route 24. Rare spawn at Route 3, Route 4 and Rock Tunnel.
005	Charmeleon	Evolves from Charmander at Level 16.
006	Charizard	Evolves from Charmeleon at Level 36. Rare spawn at Routes 1-4 and 6-25 (postgame).
007	Squirtle	Gift from Vermilion City. Rare spawn at Route 24, Route 25 and Seafoam Islands.
008	Wartortle	Evolves from Squirtle at Level 16.
009	Blastoise	Evolves from Wartortle at Level 36.
010	Caterpie	Route 2 and Viridian Forest.
011	Metapod	Viridian Forest. Evolves from Caterpie at Level 7.
012	Butterfree	Viridian Forest (Let’s Go Pikachu). Evolves from Metapod at Level 10.
013	Weedle	Route 2 and Viridian Forest.
014	Kakuna	Viridian Forest. Evolves from Weedle at Level 7.
015	Beedrill	Viridian Forest (Let’s Go Eevee). Evolves from Kakuna at Level 10.
016	Pidgey	Route 1, Route 2 and Viridian Forest, etc.
017	Pidgeotto	Routes 5 to 8, etc. Evolves from Pidgey at Level 18.
018	Pidgeot	Evolves from Pidgeotto at Level 36. In the sky at every Route except 3, 4, 9, 10, 13, 22 and 23 (postgame).
019	Rattata	Route 1 to 11, etc. Can trade for Alolan form at Cerulean City.
020	Raticate	Route 7 to 11, etc. Evolves from Rattata at Level 20 (and must be Night for Alolan form).
021	Spearow	Route 3, 4, 9, 10, 22 and 23.
022	Fearow	Route 9, 10 and 23. Evolves from Spearow at Level 20.
023	Ekans	Exclusive to Let’s Go Eevee. Route 3 and Route 4.
024	Arbok	Exclusive to Let’s Go Eevee. Evolves from Ekans at Level 22.
025	Pikachu	Viridian Forest.
026	Raichu	Use Thunder Stone on Pikachu (not partner). Can trade for Alolan form at Saffron City.
027	Sandshrew	Exclusive to Let’s Go Pikachu. Route 3 and Route 4. Can trade for Alolan form at Celadon City.
028	Sandslash	Exclusive to Let’s Go Pikachu. Evolves from native Sandshrew at Level 22. Use Ice Stone on Alolan Sandshrew.
029	Nidoran (F)	Route 9, 10, 22 and 23.
030	Nidorina	Route 9, 10 and 23. Evolves from Nidoran (F) at Level 16.
031	Nidoqueen	Route 23. Use Moon Stone on Nidorina.
032	Nidoran (M)	Route 9, 10, 22 and 23.
033	Nidorino	Route 9, 10 and 23. Evolves from Nidoran (M) at Level 16.
034	Nidoking	Route 23. Use Moon Stone on Nidorino.
035	Clefairy	Mt. Moon.
036	Clefable	Mt. Moon. Use Moon Stone on Clefairy.
037	Vulpix	Exclusive to Let’s Go Eevee. Route 5 to 8. Can trade for Alolan form at Celadon City.
038	Ninetales	Exclusive to Let’s Go Eevee. Route 7 and 8. Use Fire Stone on native Vulpix or use Ice Stone on Alolan Vulpix.
039	Jigglypuff	Route 5 to 8.
040	Wigglytuff	Use Moon Stone on Jigglypuff.
041	Zubat	Mt. Moon, Rock Tunnel, Diglett’s Cave, Pokémon Tower, Seafoam Islands and Victory Road
042	Golbat	Rock Tunnel, Pokémon Tower, Seafoam Islands and Victory Road. Evolves from Zubat at Level 22.
043	Oddish	Exclusive to Let’s Go Pikachu. Route 1, 2 and Viridian Forest, etc.
044	Gloom	Exclusive to Let’s Go Pikachu. Route 12-15 and 21. Evolves from Oddish at Level 21.
045	Vileplume	Exclusive to Let’s Go Pikachu. Route 21. Use Leaf Stone on Gloom.
046	Paras	Mt. Moon.
047	Parasect	Evolves from Paras at Level 24.
048	Venonat	Route 14, 15, 24 and 25.
049	Venomoth	Route 14 and 15. Evolves from Venonat at Level 31.
050	Diglett	Diglett’s Cave. Can trade for Alolan form at Lavender Town.