PIKACHU:Starter Pokemon (Level 5)
CHARMANDER:Man on Route 24 (Level 10)
BULBASAUR:House in Cerulean City  (Level 10)
SQUIRTLE:Woman in Vermilion City (defeat Lt. Surge) (Level 10)
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)
DUGTRIO:Internal trade in gate on Route 11
MR. MIME:Internal trade on Route 2
MUK:Internal trade in Cinnabar Island
PARASECT:Internal trade between Cycling Road and Fuchsia City
RHYDON:Internal trade in Cinnabar Island
DEWGONG:Internal trade in Cinnabar Island
MACHOKE:Internal trade in Route 5 Underground Path gate
ABRA:Game Corner prize (Level 15, 230 coins)
VULPIX:Game Corner prize (Level 18, 1000 coins)
WIGGLYTUFF:Game Corner prize (Level 22, 2680 coins)
SCYTHER:Game Corner prize (Level 30, 6500 coins)
PINSIR:Game Corner prize (Level 30, 6500 coins)
PORYGON:Game Corner prize (Level 26, 9999 coins)