You can't, but you can pick up a metal box or choose the metal option in special brawl.
theres no hack
You need the homebrew channel
Sonic is in SSBB.
no metel sonic in ssbb
You can't get sonic in SSBM only in SSBB and in SSBB you get him at the subspace emissary near the end
Sonic.
with the smash ball
No , Only In SSBB
No.
You cannot do this.
no
Sonic doesnt have any other costumes.