Mega metagross, looks ok.
But metagross is already a pseudo - legendary pokemon with base stats 600, become mega is super op liao.

Hmm, it is rumoured that mega metagross will have all of its stats increased, but Idk how much they are increased. With its very high attack stat, and the ability tough claw which increases 33% of all its contact movements, it's no doubt that its steel attacks like meteor mash is going to deal tremendous damage.