The complete Pokemon RBY pokedex, part 6

Pokémon Name: Poliwrath
Type: Water/Fighting
Classification: Tadpole Pokemon
Pokédex Number: 062
Ability: Damp and Water Absorb
Dream World ability: Swift Swim
Useful Attacks: Dynamicpunch
Location Found:
D/P/P/HG/SS: Evolve from Poliwhirl
B/W: Wellspring Cave, Victory Road, Challenger's Cave, Giant Chasm (all via Fishing, bubble spots only)

One of the final forms of Poliwag. This version further mixes Fighting with Water by offering the move Dynamicpunch, a devastating assault that injures and confuses, but only hits half the time. Your other choice is using a King's Rock on Poliwhirl to get Politoed instead.

Evolution: From Poliwhirl via Water Stone