ShieldonタテトプスUnlimited

Flip a coin. If heads, during your opponent's next turn, if Shieldon would be Knocked Out by damage from an attack, Shieldon is not Knocked Out and its remaining HP becomes 10 instead.

Does 10 damage to 2 of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)