KAIGA

English card reference
If an attack does damage to the Defending Pokémon (after applying Weakness and Resistance), that attack does 20 more damage to that Pokémon until the end of your next turn.
Cost: Colorless
Flip 2 coins. This attack does 10 damage times the number of heads.
It looks just like a Poké Ball. It is dangerous because it may electrocute or explode on touch.

Pikachu