Golbat

Once it bites, it will not stop draining energy from the victim even if it gets too heavy to fly.

Ability — Sneaky Bite: When you play this Pokémon from your hand to evolve 1 of your Pokémon, you may put 2 damage counters on 1 of your opponent's Pokémon.

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