Rotom

Its electric-like body can enter some kinds of machines and take control in order to make mischief.

Discharge (40x): Discard all Lightning Energy attached to Rotom. Flip a coin for each Energy card you discarded. This attack does 40 damage times the number of heads.

Uproar: This attack does 10 damage to each of your opponent's Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)