I've gotten conflicting rulings on this.
Arceus (metal)
Does 40 damage and prevents all effects of an attack including damage from a LvX during the opponent's next turn.
Mewtwo LvX
Poke-body; Prevents damage and effects done to Mewtwo from non-evolved pokemon.
Mewtwo would stop the damage, but does it also prevent Arceus from protecting itself during the next turn as the effect of the attack isn't targeted towards Mewtwo?
Arceus (metal)
Does 40 damage and prevents all effects of an attack including damage from a LvX during the opponent's next turn.
Mewtwo LvX
Poke-body; Prevents damage and effects done to Mewtwo from non-evolved pokemon.
Mewtwo would stop the damage, but does it also prevent Arceus from protecting itself during the next turn as the effect of the attack isn't targeted towards Mewtwo?