BULBASAUR:Starter Pokemon (Level 5)
CHARMANDER:Starter Pokemon (Level 5)
SQUIRTLE:Starter Pokemon (Level 5)
EEVEE:Celadon Mansion (Level 25)
HITMONLEE:One of two Pokemon obtained in the Fighting Dojo in Saffron City (Level 30)
HITMONCHAN:One of two Pokemon obtained in the Fighting Dojo in Saffron City (Level 30)
MEW:Not normally obtainable except through Nintendo promotions, though a stable method for encountering is now available.
ARTICUNO:Seafoam Islands (Level 50)
ZAPDOS:Power Plant (Level 50)
MOLTRES:Victory Road (Level 50)
AERODACTYL:Resurrected from Old Amber in Cinnabar Lab (Level 30)
OMANYTE:Resurrected from Helix Fossil in Cinnabar Lab (Level 30)
KABUTO:Resurrected from Dome Fossil in Cinnabar Lab (Level 30)
LAPRAS:Silph Co. (Level 25)
SNORLAX:West of Celadon City and on east side of Route 11 (Level 30)
MEWTWO:Cerulean Cave (Level 70)
VOLTORB:Appears as item balls six times in Power Plant (Level 40)
KANGASKHAN:Internal trade in gate on Route 11
MR. MIME:Internal trade on Route 2
KRABBY:Internal trade in Cinnabar Island
FARFETCH'D:Internal trade in Vermilion City
TAUROS:Internal trade between Cycling Road and Fuchsia City
HAUNTER:Internal trade in Cerulean City
GRAVELER:Internal trade in Cinnabar Island
SLOWPOKE:Internal trade in Cinnabar Island
POLIWAG:Internal trade in Route 5 Underground Path gate
ABRA:Game Corner prize (Level 8, 150 coins)
PIKACHU:Game Corner prize (Level 12, 620 coins)
HORSEA:Game Corner prize (Level 18, 1000 coins)
CLEFABLE:Game Corner prize (Level 24, 2880 coins)
DRAGONAIR:Game Corner prize (Level 30, 5400 coins)
PORYGON:Game Corner prize (Level 22, 8300 coins)