i know lots of people say the magical superheros like thor with his gear can squash manhattan but listen to me on this one
here are a few points to consider about Dr.Manhattan's powers
1.he is not limited in any way physical or otherwise (he is an entity much like god)
2.he can manipulate matter to his will (meaning if he wanted he could snap the entire universe or even create a few)
3.he has no weakness or fatigue at any point so he can keep bashing others for decades (apart from tachions but they only effect his time vision)
4.he can see into the past and future
5.there is actually no way to retain him or get control over his location because he can teleport to wherever he chooses
so who (apart from The One Above All) can be a match for this enormously powerful entity?