Suggested by Anon Gamera is pretty powerful but he won’t last long against Yami Yugi’s array of monsters. Yugi’s has his dark magician as well as Slifer. Those 2 monsters have enough power on their own to take Gamera down. You don’t want to underestimate these duel monsters. Keep in mind that Yugi has dozens of other monsters he can use as backup. The odds are just stacked against the Kaiju this time. I’m sure he could take down a few monsters along the way though. Yami Yugi wins