Okay uhm, I think Tough Claws is a 1.33 boost to ANY Physical move, and that's with a base ATK of 130.
Mega Charizard Y on the other hand has Drought and a base ATK of 159 with a x1.5 boost to FIRE moves only, with the side effect of making WATER moves weaker while Mega Charizard X takes x1 damage.
So which one has more power? I'm not quite sure, I mean Mega Charizard Y has Solarbeam as well as boosted Fire Blast and such, but Mega Charizard X can apply that to moves like Iron Tail and Earthquake as well.
So which one is better offensively?