Didn't one Megatron combine with Unicron or something? Since Unicron is a multiversal god-thing, that one can probably take him if he did it.
Unicron Trilogy Megatron/Galvatron, yeah
His feats put him at planetary at most though, best one is him managing to tow Cybertron
20:25 OnimaruXLR: i thought i had seen everything
20:26 OnimaruXLR: and then i saw someone use a sarlaac pit and an x-wing to simulate sexual penetration in a star wars mmo