Board Thread:General Discussions/@comment-24374385-20140118211120/@comment-133597-20140210065556

By Final Wars standards, Gigan was defeated by MOTHRA single-handedly. Twice. (I don't consider the Death Ghidorah forms to be "true" King Ghidorah forms, much like Keizer Ghidorah, and even if I did, Mothra was required to gain several new forms specifically to fight him anyway, so not really winning "by itself" par ce.).

So as cool as Gigan is, I'd have to give the fight to King Ghidorah overall.