first you have to get the red thing under your persons health to max and if they do not have one then they cannot use it. after they get to max press shift and down on the arrow keys.
no no no why is because sonic is not in super smash bros. or super smash bros melee he's in super smash bros brawl but not in the other games
His final smash is super sonic, and he goes flying into people.
First, you get Sonic, then you break the Smash ball. Use the special power and Sonic turns into Super Sonic for a short amount of time.
You can't, unless you use a hack that makes Sonic look like Shadow.
By completing SSE (Subspace Emissary or Adventure Mode.)
That's not possible because you need the smash ball however there is a glitch where if you die and then reappear right before the smash ball does appear you will receive it and can use your final smash.
hold 1 (b) then press 2 (a) then keep taping +
None, Unless you use a cheat system. Unless if you were in training and spammed Smash Ball spawning, but I doubt that was the answer you were looking for.
He doesn't exist in that game, but Sonic will be in the next Super Smash Bros. === Another Answer : Shadow will be in your assist tophy set and when picked he will use his ability of Chaos Control and slow down time giving you a chance of defeating your opponent after you unlock Sonic in Brawl===
Keep fighting till you see a CD or if you are lazy use Gameshark or Action Replay.
Use Sonic's Final Smash after getting a Smash Ball. And it's Super Sonic, not Hyper Sonic.
You can not use Miis as characters in Super Smash Bros Brawl.