1. Lucario block hole glitch.
Have two Lucario's on the same team stand as close together as they can with their backs to each other. Press B on both to charge up two shadow balls once it is fully charged leave it behind you without pressing anything. players should get stuck inside the 2 shadow balls slowly building up damage.
2. Hothead black hole glitch
make a custom stage with a wall like this–> [ ]
then, on training mode, put down lots [ ]
of hotheads, hit them so that they are __[ ]
Really big and throw them all against that [ ]
wall. they should get stuck. then get [ ]
Player 2 to jump in. they will get loads of [ ]
damage really quickly and fly of screen. [ ]
(Note: this only works on some versions of the game)
3. Giga Jiggly
Have a training mode with jigglypuff and yoshi on the stage "Bridge of Eldin". Get a final smash ball as jiggly puff and use final smash where the bridge will be rebuilt just before it has been rebuilt. you will start to grow, get hit and remain that size. to get even bigger use yoshi's B move on jigglypuff.
4.falling bowser glitch
to perform this, you need a [ ][ ][ ]
custom stage set out like this.—> [ ]__[ ]
Then, with bowser on giant X
brawl mode, stand where [ ][ ][ ][ ][ ]
the "X" is and use up-B. you should get stuck in a falling position.
5. Undead bowser
have a stamina match with bowser on 1 HP and use final smash. then attack the giga bowser who will turn back and be on 0 Hp and still alive. while in this state, Bowser can be defeated by Squirtle's water gun (B) or Mario's F.L.U.D.D (down-B) and these are attacks that do not even damage foes.
Those are just some that I know, you post yours as well.