I got these before I got a cheating advice:
Pokemon Gold:
Nothing except Gyarados
Pokemon Silver:
Gyarados (duh)
Donphan in Silver Cave (I couldn't catch it because my box was full!! But I later found a Phanpy on Route 45!! LUCKY!!)
Drowzee on Route 34
Pokemon Crystal:
Nothing except Gyarados and Pokemon from the Odd Egg
Pokemon Ruby:
Oddish in Safari Zone Entrance
Pokemon Sapphire:
Sableye in Sky Pillar's 5th Floor
Lotad on Route 114
Pokemon FireRed:
Ditto in Cerulean Cave
Pokemon LeafGreen:
Nothing
Pokemon Emerald:
Nothing