The complete Pokemon RBY pokedex, part 8

Pokémon Name: Slowpoke
Type: Water/Psychic
Classification: Dopey Pokemon
Pokédex Number: 079
Ability: Oblivious and Own Tempo
Dream World ability: Regenerator
Useful Attacks: Disable
Location Found:
Pearl: Route 205
Diamond: Trade with P/P/HG/SS or transfer from GBA via Pal Park
Platinum: Route 205 North (Poke Radar)
HG/SS: Slowpoke Well, Tohjo Falls, Safari Zone (Rocky Beach); Pokewalker - Beautiful Beach
B/W: Abundant Shrine (via Surf)

When your classification is "Dopey," things aren’t looking too good. Slowpoke's famous for being dimwitted and torturously slow, and the moves it learns naturally aren't an overly impressive counterbalance. He's fun to play with, level up and all that, but odds are you can find a more useful Pokemon. Two evolution options await - Slowbro and Slowking.

Evolution: To Slowbro at 37, to Slowking via King's Rock