Primeape

It grows angry if you see its eyes and gets angrier if you run. If you beat it, it gets even madder.

Poke-BODY — Anger Point: If Primeape has any damage counters on it, Primeape's attacks do 40 more damage to the Active Pokémon (before applying Weakness and Resistance).

Whump (50): Primeape is now Confused. Flip a coin. If heads, the Defending Pokémon can't attack during your opponent's next turn.