you cant you just have to survive for as long as possible
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go to arcadeprehacks.com
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.)
Okay, first off, you get to the point where you have to fight Metal Madness, and just work hard to kick his butt. Then, you'll fight Metal Overlord with Team Super Sonic. Kick his butt. Simple as that.
finish all 4 stories and get all 7 chaos emeralds to unlock the last story