User blog comment:Matt Hadick/Ultimate Battle Final Round/@comment-11132490-20130710212454/@comment-3367060-20130710234352

If you go by saying that for what we know that Godzilla wouldn't hurt Optimus' armor then I can say that for what we know Optimus' weapons could completely not affect Godzilla at all.

But still, Godzilla could jump in the air and land on his belly on top of Optimus and -phew- he's been shut down. (Godzilla has done belly flops before, Godzilla vs. Megaguirus)