M Aggron-EX (PRC 154)
Megaton Slam
120+
You may flip a coin. If heads, this attack does 120 more damage. If tails, this attack does 20 damage to each of your Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)
When a Pokémon-EX has been Knocked Out, your opponent takes 2 Prize cards.
When 1 of your Pokémon becomes a Mega Evolution Pokémon, your turn ends.