User blog comment:Neo godzilla/Who do you think is godzilla's greatest rival?/@comment-4200959-20110725194321

depends what you mean. mothra is his most recurring enemy however i would say that king ghidirah is his arch nemesis as well for most powerful that would definitely be bagan. also remember ppl grand king ghidorah king ghidorah keizer ghidorah and desighidorah are all different kaiju not different forms of the same monster