The complete Pokemon RBY pokedex, part 6

Pokémon Name: Primeape
Type: Fighting
Classification: Pig Monkey Pokemon
Pokédex Number: 057
Ability: Vital Spirit and Anger Nerve
Dream World ability: Defiant
Useful Attacks: Close Combat
Location Found:
D/P/P: Route 225 and Route 226 (Poke Radar)
HG: Route 9 and Cerulean Cave
SS: Trade with D/P/P/HG
B/W: Evolve Mankey

Both Mankey and Primeape are known for their furious temperament, but the latter is almost Hulk-like in its rage. The move Rage allows Primeape to become stronger each time it's hit, a feat further enhanced by Anger Nerve, which increases its attack each time a critical hit connects. To balance this extreme power, Primeape's defense is notably low.

Evolution: From Mankey at 28