mimikyu

Safeguard reads: Prevent all damage done to this Pokémon by attacks from your opponent’s Pokémon ex and Pokémon V. But if Mew Vmax is using Meloetta’s attack through Cross Fusion Strike, which attack is doing the damage? And would it make a difference if Mew has a Fusion Energy attached?

Suppose Player A has a Buzzwole (FLI 77). Both players have 4 prizes remaining, and Sledgehammer knocks out Player B's active Pokémon-GX by doing 120 damage, taking Player A to 2 prizes remaining. Player B then promotes Mimikyu (GRI 58) and announces Copycat. Whose prize cards are considered...