Gastrodon West Sea RR 22

Choose 1 of your opponent's Pokémon. This attack does 30 damage to that Pokémon and 10 damage to each of your opponent's other Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)

Does 60 damage plus 10 more damage for each of your Benched Pokémon that has any damage counters on it.