I assume you're talking about Sonic Heroes. The answer is nope, you can only play as Super Sonic in the final boss fight against Metal Overlord *Metal Sonic*.
you can play as it and the first beat all the teams and you'll get team metal sonic
metal sonic definatly metal sonic is designed to be better than sonic while bass is designed to be exactly like megaman. so metal sonic wins and he's as fast as sonic so bass wouldn't be able to touch him. and metal overlord is one of metal sonic's strongest forms. and it took team super sonic to beat him. so metal sonic. period.
to fight metal sonic in sonic heroes, you have to beat all of the other team's stories, and once that is done, in story select (when you choose the team you want to play as in story mode) keep on going right and you'll see a team called LAST with metal sonic on it. (this is kinda hard.)
Sonic. He beat Metal Sonic in a race to save Amy.
Seeing as how Shadow and Sonic are of equal ability, Shadow would be able to beat Metal Sonic. This is because Metal Sonic cannot beat regular Sonic.
the answer is yes,but you can only be Sonic,Tails,Kunx,Shadow,Eggman,Rouge the bat No I beat sonic heroes And NO CHAO WORLD.
yes u have to beat all the story modes get keys in the stages clear the stages with out getting hit and chase one chaos emerald each key
somehow
beat the game? lol
you have to beat all the story modesexample:team sonic, team amy,etc
Simply beat the final stage, mission 3. THe rival duel between Sonic and M.Sonic. In order to get the final stage you must clear the all team stories. (ROSE, DARK, BABYLON, and HEROES)