Best "trick" on SSBB

[Peanut64]

Like, having a trick that helps gameplay not implented by Nintendo. Mine is making Fox use his reflector in the air rapidly to slow him down, or the Kirby 'Quake Glitch'.

[Level 3]

Abusing Samus's Z-air, and abusing missle cancelling, to completely annoy everyone.

[KidIcarus]

I like Jigglypuff's Final Smash cancel glitch on Bridge of Eldin.

[pikachu8090]

Master Hand glitch I did it on past jungle japes and half way through the match the finger beam glitched. It was very cool.

[Miles of SmashWiki]

Master Hand glitch I did it on past jungle japes and half way through the match the finger beam glitched. It was very cool.

That's not SSBB, which the thread title indicates, but it is a pretty famed glitch by now.

The black hole glitch in Melee is fun as well.

[R7308xx]

Wall of Pain and momentum canceling are mine.

[pikachu8090]

I like Jigglypuff's Final Smash cancel glitch on Bridge of Eldin.

Its so cool seeing Jigglypuff bigger than the screen 

[KidIcarus]

My favorite is using Lucas's pk thunder to hit himself