M Barrier Attack 10

During your opponent's next turn, any damage done to Registeel Star by attacks is reduced by 10 (after applying Weakness and Resistance).

MMC Final Laser

Put 3 damage counters on your opponent's Pokémon in any way you like. If your opponent has only 1 Prize card left and Registeel Star is the only Pokémon you have in play, put 6 damage counters instead.