from Bowler's video "New SSF2 1.2 Tips and Tricks for the New Characters!"
If you tap up right at the end of Lucario's UpB when grounded (or perfectly space it when mid-air), lucario receives no endlag or helplessness, pretty much granting him an extremely fast dash with high aura
And if you wanna really flex on someone,
aura dashdance (well, not quite dashdance but close)
remember how chibi robo pocketing the aura sphere would make a black hole: show Yeah, so..
Lucario can do that temporarily by doing the following:
1: be mid-air
2: press B and hold shield
3: Press B again as soon as he cancels the first aura sphere (and release the shield button so he doesn't cancel this one either)
Ta-da! double aura sphere!
And by the way, it doesn't work all the time even if you did everything correctly.
This one's goin in the bug reports
edit: It also traps opponents in place if both aura spheres are connecting, the only way out is with SDI. so this is sort of an infinite with Lucario