Any damage done to Registeel ex by attacks is reduced by 10 (after applying Weakness and Resistance).
[M][M][C] Steel Wave: 50
Does 20 damage to each of your opponent’s Benched Pokémon of the same type as the Defending Pokémon. (Don’t apply Weakness and Resistance for Benched Pokémon.)
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.