The Godzilla movies are full of strong monsters. Godzilla himself has fought off all-comers to protect the earth/ravage the world (depending on the film). Different incarnations of Mothra have put Godzilla in his place several times, and King Ghidorah has fought him in several of his best movies. Thats not to mention Destoroyah and Mechagodzilla, who beat Godzilla a few times.