| 1 | Bulbasaur | LeafGreen | Starter| 2 | Ivysaur | LeafGreen | Evolve Bulbasaur (Lv. 16) | 3 | Venusaur | LeafGreen | Evolve Ivysaur (Lv. 32) | 4 | Charmander | LeafGreen | Starter | 5 | Charmeleon | LeafGreen | Evolve Charmander (Lv. 16) | 6 | Charizard | LeafGreen | Evolve Charmeleon (Lv. 36) | 7 | Squirtle | LeafGreen | Starter | 8 | Wartortle | LeafGreen | Evolve Squirtle (Lv. 16) | 9 | Blastoise | LeafGreen | Evolve Wartortle (Lv. 36) | 10 | Caterpie | LeafGreen | Routes 2, 24, 25, Viridian Forest, Pattern Bush | 11 | Metapod | LeafGreen | Routes 24, 25, Viridian Forest, Pattern Bush | 12 | Butterfree | LeafGreen | Evolve Metapod (Lv. 10) | 13 | Weedle | LeafGreen | Routes 2, 24, 25, Viridian Forest, Pattern Bush | 14 | Kakuna | LeafGreen | Route 24, 25, Viridian Forest, Pattern Bush | 15 | Beedrill | LeafGreen | Evolve Kakuna (Lv. 10) | 16 | Pidgey | LeafGreen | Routes 1, 2, 3, 5, 6, 7, 8, 12, 13, 14, 15, 24, 25, Bond Bridge, Berry Forest, Five Isle Meadow | 17 | Pidgeotto | LeafGreen | Routes 13, 14, 15, Bond Bridge, Berry Forest, Five Isle Meadow | 18 | Pidgeot | LeafGreen | Evolve Pidgeotto (Lv. 36) | 19 | Rattata | LeafGreen | Routes 1, 2, 4, 9, 16, 17, 18, 22, Pokémon Mansion | 20 | Raticate | LeafGreen | Routes 16, 17, 18, Pokémon Mansion | 21 | Spearow | LeafGreen | Routes 3, 4, 9, 10, 11, 16, 17, 18, 22, 23, Treasure Beach, Mt. Ember, Cape Brink, Ruin Valley, Water Path, Canyon Entrance, Kindle Road | 22 | Fearow | LeafGreen | Routes 17, 18, 23, Treasure Beach, Kindle Road, Mt. Ember, Cape Brink, Ruin Valley, Water Path, Canyon Entrance, Sevault Canyon | 23 | Ekans | LeafGreen | Trade, Event | 24 | Arbok | LeafGreen | Trade | 25 | Pikachu | LeafGreen | Viridian Forest, Power Plant | 26 | Raichu | LeafGreen | Evolve Pikachu (Thunder Stone) | 27 | Sandshrew | LeafGreen | Routes 4, 8, 9, 10, 11, 23 | 28 | Sandslash | LeafGreen | Route 23, Victory Road | 29 | NidoranF | LeafGreen | Route 3, Safari Zone | 30 | Nidorina | LeafGreen | Safari Zone | 31 | Nidoqueen | LeafGreen | Evolve Nidorina (Moon Stone) | 32 | NidoranM | LeafGreen | Route 3, Safari Zone
| Trade NidoranF in Underground Path (Kanto Routes 5-6) 33 | Nidorino | LeafGreen | Safari Zone
| Trade Nidorina on Route 11 34 | Nidoking | LeafGreen | Evolve Nidorino (Moon Stone) | 35 | Clefairy | LeafGreen | Mt. Moon, Celadon City (Rocket Game Corner) | 36 | Clefable | LeafGreen | Evolve Clefairy (Moon Stone) | 37 | Vulipx | LeafGreen | Routes 7, 8, Pokemon Mansion | 38 | Ninetales | LeafGreen | Evolve Vulpix (Fire Stone) | 39 | Jigglypuff | LeafGreen | Route 3 | 40 | Wigglytuff | LeafGreen | Evolve Jigglypuff (Moon Stone) | 41 | Zubat | LeafGreen | Mt. Moon, Rock Tunnel, Seafoam Islands, Victory Road, Icefall Cave, Lost Cave, Altering Cave | 42 | Golbat | LeafGreen | Cerulean Cave, Icefall Cave, Lost Cave, Seafoam Islands, Victory Road | 43 | Oddish | LeafGreen | Trade, Event | 44 | Gloom | LeafGreen | Trade | 45 | Vileplume | LeafGreen | Trade | 46 | Paras | LeafGreen | Mt. Moon, Safari Zone | 47 | Parasect | LeafGreen | Safari Zone, Cerulean Cave | 48 | Venonat | LeafGreen | Routes 12, 13, 14, 15, Berry Forest, Bond Bridge, Safari Zone | 49 | Venomoth | LeafGreen | Safari Zone, Berry Forest | 50 | Diglett | LeafGreen | Diglett's Cave | 51 | Dugtrio | LeafGreen | Diglett's Cave | 52 | Meowth | LeafGreen | Routes 5, 6, 7, 8, Bond Bridge, Canyon Entrance, Cape Brink, Five Isle Meadow, Kindle Road, Ruin Valley, Sevault Canyon, Treasure Beach, Water Path | 53 | Persian | LeafGreen | Bond Bridge, Canyon Entrance, Cape Brink, Five Isle Meadow, Kindle Road, Ruin Valley, Sevault Canyon, Treasure Beach, Water Path | 54 | Psyduck | LeafGreen | Trade, Event | 55 | Golduck | LeafGreen | Trade | 56 | Mankey | LeafGreen | Routes 3, 4, 22, 23, Rock Tunnel | 57 | Primeape | LeafGreen | Route 23, Cerulean Cave, Victory Road | 58 | Growlithe | LeafGreen | Trade | 59 | Arcanine | LeafGreen | Trade | 60 | Poliwag | LeafGreen | Fuchsia City, Berry Forest, Safari Zone (Good Rod)
| Routes 6, 22, 23, 25, Four Island, Viridian City, Cape Brink, Cerulean Cave, Icefall Cave, Ruin Valley (Good Rod and Super Rod) 61 | Poliwhirl | LeafGreen | Routes 6, 22, 23, 25, Four Island, Viridian City, Cape Brink, Cerulean Cave, Icefall Cave, Ruin Valley (Super Rod) | 62 | Poliwrath | LeafGreen | Evolve Poliwhirl (Water Stone) | 63 | Abra | LeafGreen | Routes 24, 25, Celadon City (Rocket Game Corner) | 64 | Kadabra | LeafGreen | Cerulean Cave | 65 | Alakazam | LeafGreen | Evolve Kadabra (Trade) | 66 | Machop | LeafGreen | Mt. Ember, Rock Tunnel, Victory Road | 67 | Machoke | LeafGreen | Cerulean Cave, Mt. Ember, Victory Road | 68 | Machamp | LeafGreen | Evolve Machoke (Trade) | 69 | Bellsprout | LeafGreen | Routes 5, 6, 7, 12, 13, 14, 15, 24, 25, Berry Forest, Bond Bridge, Cape Brink, Water Path | 70 | Weepinbell | LeafGreen | Routes 12, 13, 14, 15, Berry Forest, Bond Bridge, Cape Brink, Water Path | 71 | Victreebel | LeafGreen | Evolve Weepinbell (Leaf Stone) | 72 | Tentacool | LeafGreen | Routes 4, 10, 11, 12, 13, 19, 20, 21, 24, Treasure Beach, Kindle Road, Bond Bridge, Five Isle Meadow, Memorial Pillar, Water Labyrinth, Resort Gorgeous, Water Path, Green Path, Outcast Island, Tanoby Ruins, Pallet Town, Cerulean City, Vermilion City, One Island, Five Island, Icefall Cave, Trainer Tower, Cinnabar Island (Surfing) | 73 | Tentacruel | LeafGreen | Treasure Beach, Kindle Road, Bond Bridge, Five Isle Meadow, Memorial Pillar, Water Labyrinth, Resort Gorgeous, Water Path, Green Path, Outcast Island, Tanoby Ruins, One Island, Five Island, Icefall Cave, Trainer Tower (Surfing) | 74 | Geodude | LeafGreen | Victory Road, Mt. Moon (Walking)
| Kindle Road, Sevault Canyon, Rock Tunnel, Cerulean Cave, Mt. Ember (Tall grass and Rock Smash) 75 | Graveler | LeafGreen | Kindle Road, Sevault Canyon, Rock Tunnel, Mt. Ember, Cerulean Cave (Rock Smash) | 76 | Golem | LeafGreen | Evolve Graveler (Trade) | 77 | Ponyta | LeafGreen | Kindle Road, Mt. Ember | 78 | Rapidash | LeafGreen | Kindle Road, Mt. Ember | 79 | Slowpoke | LeafGreen | Celadon City (Surfing)
| Routes 4, 10, 11, 12, 13, 19, 20, 21, 24, Water Labyrinth, Resort Gorgeous, Memorial Pillar, Green Path, Outcast Island, Tanoby Ruins, Pallet Town, Cerulean City, Vermilion City, Cinnabar Island, One Island, Five Island, Trainer Tower (Super Rod) Routes 6, 22, 23, 25, Viridian City, Fuchsia City, Four Island, Cerulean Cave, Safari Zone (Surfing and Super Rod) Treasure Beach, Kindle Road, Bond Bridge, Five Isle Meadow, Ruin Valley, Water Path (Tall grass and Super Rod) 80 | Slowbro | LeafGreen | Cerulean Cave, Berry Forest (Surfing)
| Seafoam Islands, Cape Brink (Tall grass, surfing) Cinnabar Island (Super Rod) 81 | Magnemite | LeafGreen | Power Plant | 82 | Magneton | LeafGreen | Power Plant, Cerulean Cave | 83 | Farfetch'd | LeafGreen | Trade Spearow in Vermillion City | |