Post any glitches you find in brawl.
One with Sonic on final destination (may work on other stages…) is where you jump underneath the stage and keep doing the homing attack.
He will home into the people on the stage, but he just runs into the platform, so you can do it infinitely.
NOTE: this does not work if there is nobody on the stage. he will go diagnally down. (That means your dead btw)