Red Hulk has super strength and with it he can take down the Riddler. The Riddler was never the best fighter in the world. He just couldn’t take on the power of Red Hulk. Red Hulk has too much power for him. Red Hulk wins.
The Riddler is one of Batman’s weakest foes. Even Batman could take him on. Gon is far too quick and strong for Riddler to beat. The Riddler will be wondering what a riddle life is as he crumples to the ground. Gon also has magical yugioh ripoff cards that can teleport him. Gon wins.