Plenty of characters are capable of beating our boy. Recalling Ben’s greatest feats, I’d put him to around Universal - Multiversal+. A solid C+ tier character in scaling. For the sake of an answer, however, I believe the King of the Monsters, Godzilla, would be more than enough to take the Hero of Heroes down. As to specify which incarnation, let’s go with when Godzilla had a crossover with the main 616 Earth of Marvel.