Press B exactly when you hear the "shing" sound.
... I can't even get the short-distance Falco Phantasm on 1/4 speed.
First you enter a "I'm about to side-B" stance, then there's a shiney animation accompanied by a sucking noise. When that's done, there's a "shing" sound, which is followed immediately by the attack.
It also seems that the 'shing' occurs at the same moment as Falco begins to move his left wing from the ready stance.
How many frames are we talkin' here? Some sorta guess.
You don't have to actually do an up smash, simply hold the control stick up and mash A during your dash attack.
*energetic, gullible voice*
Is that true?
One final thing: So far I've only been able to do a DL smash IF the dash attack was initiated on the first step of the dash animation (so he hops forward, then appears to kick right off the ground from that).
Do I need to hit near the beginning of the dash attack too? Because I haven't succeeded with the end of it.
*resurrects Q & A thread*