Pokémon found in Platinum's Regional PokéDex:
- Kadabra > Alakazam
- Graveler > Golem
- Onix > Steelix (hold Metal Coat)
- Machoke > Machamp
- Haunter > Gengar
- Rhydon > Rhyperior (hold Protector)
- Dusclops > Dusknoir (hold Reaper Cloth)
- Porygon > Porygon2 (hold Upgrade)
- Porygon2 > Porygon-Z (hold Dubious Disk)
- Scyther > Scizor (hold Metal Coat)
- Electabuzz > Electivire (hold Electrizer)
- Magmar > Magmortar (hold Magmarizer)
Source
Pokémon found on that battle-island-thing you unlock after beating the Elite 4:
- Seadra > Kingdra (hold Dragon Scale)
- Poliwhirl > Politoed (hold King's Rock)
Source
PokéRadar Pokémon
- Slowpoke > Slowking (hold King's Rock)
Source
