Technically super sonic can already defeat Solaris (as seen from 06), but only in 1 time period. the 'enduring metal of The Founders Table' (whenever it arrives). You NEED 3 people to fight it (One in the future, one in the present and one in the past). And it cost only 20 million (officially) or perhaps 25 million ('We don't know yet,'. Solaris is impossible to defeat alone, not because sonic is too weak, but because that's how it works. Perfect Dark Gaia will require Hyper Sonic though as we have no evidence that super sonic can defeat it. Shadow in his game performed a bigger chaos control than in Sa2 alone, so I assume that sonic can do the same (not only that, but biolizard was almost defeated by base form shadow). Metal Overlord is the fully transformed state of Metal Madness and serves as the final boss of Sonic Heroes.After Team Rose, Team Chaotix, and Team Dark, defeats Metal Madness, the robot completes his transformation to become Metal Overlord and flies off into the skies. I mean, Sonic has become so strong over the years that he can solo Perfect chaos in his base form (Sonic Generations). Yes? We have seen him do it in the games WITHOUT hyper for some of these.

Metal overlord vs perfect chaos