You probably need to either finish the vault or get it randomly from the CD's that randomly appear.
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 Heros
you can't
Sonic doesnt have any other costumes.