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.)
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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.
You need to complete all 4 stories,so if you don`t do any stages other than those in story mode,it is 56 emblems.
Metal Sonic doesn't get a story in Sonic Adventure however you can play him in trial mode to unlock him get all the emblems you can go to every level Sonic goes to as Metal Sonic you can even fight the bosses and play the minigames.
There is no Sonic Heroes 2.
Yes, you need to get A's on every mission and get all emblems. The team is: Speed: Neo Metal Sonic, Power: Chaos 0, Fly: Eggman in his Egg Flying thinermajig...