http://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_Red_and_Green_beta#Prototype_names
Some of the more notable:
Vulpix - Foxfire
Jigglypuff - Pudding
Wigglytuff - Custard
Growlithe - Flamie
Arcanine - Blaze
Poliwag - Aqua
Abra - Hocus
Kadabra - Pocus
Machop - Kara-tee
Machoke - Kung-foo
Machamp - Ju-doh
Tentacool - Jilly
Tentacruel - Man O War
Magnemite - Coil
Magneton - Recoil
Gastly - Spirit
Haunter - Spectre
Gengar - Phantom
Drowzee - Sleeper
Cubone - Orphan
Lickitung - Tonguetyd
Seaking - Neptune
Gyarados - Skulkraken
Ditto - Morpho
Omanyte - Ess
Omastar - Kargo
Kabuto - Att
Kabutops - Lantis
--
Not changing this sig until I decide to change this sig.
Started: July 6, 2005