Carnivine G.

Choose 1 of your opponent's Pokémon. This attack does 10 damage for each Energy attached to Carnivine G to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)

Does 20 damage plus 10 more damage for each Colorless Energy in the Defending Pokémon's Retreat Cost (after applying effects to the Retreat Cost).