Forretress (Flashfire 60/106)
Ability Thorn Tempest

When you play this Pokémon from your hand to evolve 1 of your Pokémon, you may put 1 damage counter on each of your opponent's Pokémon.

Colorless Colorless
Iron Crush

This attack does 20 more damage for each Colorless in your opponent's Active Pokémon's retreat cost.