For each Pokémon in your opponent's discard pile, put 1 damage counter on your opponent's Pokémon in any way you like. If you placed any damage counters in this way, your opponent shuffles all Pokémon from their discard pile into their deck.
During your opponent's next turn, this Pokémon takes 30 less damage from attacks (after applying Weakness and Resistance).This attack also does 30 damage to each of your Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)