Suggested by Sonic Flatman can stretch and is effectively known as a second rate Mr Fantastic. While Reed Richards has a lot of useful gadgets that are good in a fight, Flatman doesn’t have nearly the same kind of arsenal at his disposal. Mr Game and Watch can transform into a giant spider/squid and can change himself into various objects as well. His hammer and torch will be hard for Flatman to deal with and it’s not like Flatman can just squeeze him like he would most opponents. Game and Watch is already 2D so that is out of the question. Mr Game and Watch wins.