Walrein ex

As long as Walrein ex is your Active Pokémon, put 1 damage count on each Active Pokémon (both yours and your opponent's) between turns, excluding Water Pokémon.

Choose 1 of your opponent's Pokémon. This attack does 40 damage to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)