| 1 | Bulbasaur | Yellow | Received in Cerulean City (If starter Pikachu's friendship is 147+)| 2 | Ivysaur | Yellow | Evolve Bulbasaur (Lv. 16) | 3 | Venusaur | Yellow | Evolve Ivysaur (Lv. 32) | 4 | Charmander | Yellow | Route 24 (From a trainer) | 5 | Charmeleon | Yellow | Evolve Charmander (Lv. 16) | 6 | Charizard | Yellow | Evolve Charmeleon (Lv. 36) | 7 | Squirtle | Yellow | Vermillion City (Officer Jenny) | 8 | Wartortle | Yellow | Evolve Squirtle (Lv. 16) | 9 | Blastoise | Yellow | Evolve Wartortle (Lv. 36) | 10 | Caterpie | Yellow | Viridian Forest | 11 | Metapod | Yellow | Viridian Forest | 12 | Butterfree | Yellow | Evolve Metapod (Lv. 10) | 13 | Weedle | Yellow | Trade | 14 | Kakuna | Yellow | Trade | 15 | Beedrill | Yellow | Trade | 16 | Pidgey | Yellow | Routes 1, 2, 5, 6, 7, 8, 11, 12, 13, 21, 24, 25, Viridian Forest | 17 | Pidgeotto | Yellow | Routes 5, 6, 7, 8, 11, 12, 13, 14, 15, 21, 24, 25, Viridian Forest | 18 | Pidgeot | Yellow | Evolve Pidgeotto (Lv. 36) | 19 | Rattata | Yellow | Routes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 18, 21, 22, Pokémon Mansion | 20 | Raticate | Yellow | Routes 9, 10, 11, 16, 18, 21, Pokémon Mansion | 21 | Spearow | Yellow | Routes 3, 4, 9, 16, 18, 22 | 22 | Fearow | Yellow | Routes 9, 16, 17, 18, 23 | 23 | Ekans | Yellow | Trade | 24 | Arbok | Yellow | Trade | 25 | Pikachu | Yellow | Starter | 26 | Raichu | Yellow | Trade | 27 | Sandshrew | Yellow | Routes 3, 4, Mt. Moon | 28 | Sandslash | Yellow | Cerulean Cave | 29 | NidoranF | Yellow | Routes 2, 9, 10, 22, Safari Zone | 30 | Nidorina | Yellow | Routes 9, 23, Safari Zone | 31 | Nidoqueen | Yellow | Evolve Nidorina (Moon Stone) | 32 | NidoranM | Yellow | Routes 2, 9, 10, 22, Safari Zone | 33 | Nidorino | Yellow | Routes 9, 23, Safari Zone | 34 | Nidoking | Yellow | Evolve Nidorino (Moon Stone) | 35 | Clefairy | Yellow | Mt. Moon | 36 | Clefable | Yellow | Evolve Clefairy (Moon Stone) | 37 | Vulipx | Yellow | Celadon City (Rocket Game Corner) | 38 | Ninetales | Yellow | Evolve Vulpix (Fire Stone) | 39 | Jigglypuff | Yellow | Routes 5, 6, 7, 8 | 40 | Wigglytuff | Yellow | Celadon City (Rocket Game Corner) | 41 | Zubat | Yellow | Mt. Moon, Rock Tunnel, Seafoam Islands, Victory Road | 42 | Golbat | Yellow | Seafoam Islands, Victory Road, Cerulean Cave | 43 | Oddish | Yellow | Routes 12, 13, 14, 15, 24, 25 | 44 | Gloom | Yellow | Routes 12, 13, 14, 15, Cerulean Cave | 45 | Vileplume | Yellow | Evolve Gloom (Leaf Stone) | 46 | Paras | Yellow | Mt. Moon, Safari Zone | 47 | Parasect | Yellow | Safari Zone, Cerulean Cave
| Trade Tangela on Route 18 48 | Venonat | Yellow | Routes 14, 15, 24, 25 | 49 | Venomoth | Yellow | Routes 14, 15, Cerulean Cave | 50 | Diglett | Yellow | Diglett's Cave | 51 | Dugtrio | Yellow | Diglett's Cave
| Trade Lickitung on Route 11 52 | Meowth | Yellow | Trade | 53 | Persian | Yellow | Trade | 54 | Psyduck | Yellow | Route 6 (Surfing) | 55 | Golduck | Yellow | Route 6 (Surfing) | 56 | Mankey | Yellow | Routes 3, 4, 22, 23 | 57 | Primeape | Yellow | Route 23 | 58 | Growlithe | Yellow | Pokemon Mansion | 59 | Arcanine | Yellow | Evolve Growlithe (Fire Stone) | 60 | Poliwag | Yellow | Routes 6, 10, 11, 12, 13, 17, 18, 19, 20, 21, 22, 23, 24, 25, Pallet Town, Viridian City, Cerulean City, Cerulean Gym, Cerulean Cave, Vermilion City, Celadon City, Fuchsia City, Safari Zone, Seafoam Islands, Cinnabar Island, Indigo Plateau (Good Rod)
| Routes 22, 23, Viridian City (Super Rod) 61 | Poliwhirl | Yellow | Routes 22, 23 (Super Rod) | 62 | Poliwrath | Yellow | Evolve Poliwhirl (Water Stone) | 63 | Abra | Yellow | Routes 5, 6, 7, 8, Celadon City (Rocket Game Corner) | 64 | Kadabra | Yellow | Route 8 | 65 | Alakazam | Yellow | Evolve Kadabra (Trade) | 66 | Machop | Yellow | Route 10, Rock Tunnel | 67 | Machoke | Yellow | Victory Road
| Trade Cubone in Underground Path (Kanto Routes 5-6) 68 | Machamp | Yellow | Trade Cubone for Machoke in Underground Path (Kanto Routes 5-6) (Evolves immediately) | 69 | Bellsprout | Yellow | Routes 12, 13, 14, 15, 24, 25 | 70 | Weepinbell | Yellow | Routes 12, 13, 14, 15, Cerulean Cave | 71 | Victreebel | Yellow | Evolve Weepinbell (Leaf Stone) | 72 | Tentacool | Yellow | Routes 19, 20, 21, Seafoam Islands (Surfing)
| Routes 11, 13, 17, 18, 19, 20, 21, Pallet Town, Vermilion City, Cinnabar Island (Super Rod) 73 | Tentacruel | Yellow | Routes 19, 20, 21 (Super Rod) | 74 | Geodude | Yellow | Mt. Moon, Rock Tunnel, Victory Road | 75 | Graveler | Yellow | Victory Road, Cerulean Cave | 76 | Golem | Yellow | Evolve Graveler (Trade) | 77 | Ponyta | Yellow | Route 17 | 78 | Rapidash | Yellow | Evolve Ponyta (Lv. 40) | 79 | Slowpoke | Yellow | Seafoam Islands
Routes 12, 13 (Surfing) | 80 | Slowbro | Yellow | Routes 12, 13 (Surfing)
Seafoam Islands (Walking) | 81 | Magnemite | Yellow | Route 10, Power Plant | 82 | Magneton | Yellow | Power Plant | 83 | Farfetch'd | Yellow | Routes 12, 13 | |