Crobat

It flies so silently through the dark on its four wings that it may not be noticed even when nearby.

Ability — Surprise Bite: When you play this Pokémon from your hand to evolve 1 of your Pokémon, you may put 3 damage counters on 1 of your opponent's Pokémon.

Skill Dive: This attack does 30 damage to 1 of your opponent's Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)