World Breaker Hulk touches the Crimson Gem of Cyttorak, eats a can of spinach, uses the infinity gauntlet to make a left handed infinity gauntlet with just as powerful copies of all the gems, and then does 100 pushups, situps, squats and 10km od running everyday for three years, finds the Necronomicon, eats lighting, craps thunder, gets up cause mickey loves him, teams up with Nega Powerman (Nega Powermans only power is to cancel out Powerman permanantly,other than that he's just a guy), aquires the Deathnote, puts on all the Lantern Rings of Power, eats the Dragon Balls and the Chaos emeralds, aquires the Elder Wand, has a pebble in his Infinity Shoe, and breaks the Ultimate Nullifer.

Who could stop him.
My money is on Droopy Dog.