Pallet Town: Pikachu ,  Staryu, Tentacool, Magikarp
Route 1: Pidgey, Rattata
Route 2: Pidgey, Rattata, Nidoran F, Nidoran M
Route 22: Rattata, Spearow, Nidoran F, Nidoran M, Mankey, Poliwag
Viridian City: Poliwag
Viridian Forest: Caterpie, Metapod, Pidgey, Pidgeotto
Routes 3,4: Rattata, Spearow, Sandshrew, Mankey
Mt. Moon: Zubat, Paras, Clefairy, Geodude, Sandshrew
Cerulean City: Bulbasaur
Route 24: Pidgey, Pidgeotto, Oddish, Venonat, Bellsprout, Charmander , Krabby, Kingler
Route 25: Pidgey, Pidgeotto, Oddish, Venonat, Bellsprout, Krabby, Kingler
Routes 5,7: Pidgey, Pidgeotto, Rattata, Jigglypuff, Abra
Route 6: Pidgey, Pidgeotto, Rattata, Jigglypuff, Abra,  Psyduck, Golduck, Goldeen
Vermillion City: Squirtle , Tentacool
Route 11: Pidgey, Pidgeotto, Rattata, Drowsee, Tentacool
Diglett's Cave: Diglett, Dugtrio
Route 9: Rattata, Raticate, Spearow, Fearow, Nidoran F, Nidorina, Nidoran M,
Nidorino, Krabby, Kingler
Route 10: Rattata, Raticate, Nidoran F, Nidoran M, Machop, Magnemite
Rock Tunnel: Zubat, Machop, Geodude, Onix
Route 8: Pidgey, Pidgeotto, Rattata, Jigglypuff, Abra, Kadabra
Celadon City: Vulpix, Abra, Wigglytuff, Pinsir, Scyther, Porygon,  Goldeen
Saffron City: HitmonChan, Hitmonlee, Lapras.
Pokémon Tower Gastly, Haunter, Cubone
Routes 12: Pidgey, Pidgeotto, Oddish, Gloom, Bellsprout, Weepinbell, Farfetch'd,  Slowpoke, Slowbro, Snorlax, Horsea, Seadra
Route 13: Pidgey, Pidgeotto, Oddish, Gloom, Bellsprout, Weepinbell, Farfetch'd,  Slowpoke Slowbro,  Horsea, Seadra
Routes 14,15: Pidgeotto, Oddish, Gloom, Venonat, Venomoth, Bellsprout, Weepinbell
Fuschia City: Magikarp, Poliwag, Goldeen, Gyrados.
Safari Zone: Nidoran F, Nidorina, Nidoran M, Nidorino, Paras, Parasect, Exeggcute, Cubone, Marowak, Rhyhorn, Chansey, Tangela, Kangaskhan, Scyther, Pinsir, Tauros,  Magikarp, Goldeen, Dratini, Dragonair
Routes 16: Rattata, Raticate, Spearow, Fearow, Doduo, Snorlax, Shellder, Goldeen, Poliwag
Route 17: Fearow, Ponyta, Doduo, Dodrio,  Shellder, Goldeen, Poliwag
Route 18: Rattata, Raticate, Spearow, Fearow, Doduo
Power Plant: Magnemite, Magneton, Grimer, Muk, Voltorb, Electrode, Zapdos
Route 19,20: Tentacool,  Staryu, Tentacool, Magikarp.
Seafoam Islands: Articuno, Zubat, Golbat, Slowpoke, Slowbro, Seel, Dewgong, Krabby, Kingler,  Tentacool, Staryu, Tentacool, Magikarp.
Pokémon Mansion: Rattata, Raticate, Growlithe, Grimer, Muk, Ditto
Route 21: Pidgey, Pidgeotto, Rattata, Raticate,  Tentacool, Staryu, Tentacool, Magikarp
Route 23: Fearow, Nidorina, Nidorino, Mankey, Primeape, Poliwag, Poliwhirl
Victory Road: Zubat, Golbat, Machoke, Geodude, Graveller, Onix, Moltres
Unknown Dungeon: Sandslash, Golbat, Gloom, Venomoth, Weepinbell, Graveller,
Lickitung, Rhyhorn, Rhydon, Chansey, Ditto, Mewtwo ,  Goldeen, Seaking