I'm gonna go with the king of all monsters, the Big G himself (herself? itself?), Godzilla! He picked up a bus and he threw it back down as he waded through the buildings towards the center of town! They say he's gotta go? Go go Godzilla!
He's also knocked the taste out of other Toho monsters' mouths, came back from the dead a half dozen times at least and even survived a US movie from Fox (with associated merchandise)! He's fought overgrown bugs with drillbits for claws, some funky sunglass wearing bird thing with a buzzsaw in his chest, hyperactive pterodactyls, incompetant ankylosaurs, both robotic and mutant clones, uber gorillas, 3 headed dragons in need of ritalin (and the robotic version) and even a rosebush that OD'd on Miraclegro.
Anyone that gives him lip gets a dose of his nuclear halitosis.