Wavebounce

Wavebounce is a movement technique that allows you to reverse momentum during a B-Special attack without actually changing the direction you're facing (as compared to a regular B-Reverse, which reverses both momentum and the direction you're facing).  It is performed by first executing a turnaround of a B-Special move, and then B-Reversing it.

This technique can be performed both aerially and on the ground if the B-Special still carries a sliding momentum during your movement (note that some B-Special moves actually halt movement on the ground, e.g. Roy's Double Edge Dance).  Wavebounce does not require custom controls to perform, though the grounded neutral B-Special version demands an incredibly stricter timing as attempting the initial turnaround B-Special involves inputting the directional stick in the opposite direction during the dash to perform, which if not timed precisely will instead initiate the slow turnaround animation (this is not problematic in the aerial version, as inputting the opposite direction while airborne does not actually cause the fighter to initiate any turnaround animation), and if the control stick is pushed too far during the initial turnaround could instead accidentally execute the side B-Special attack or if the timing is off execute a B-Reverse.

Wavebounce and especially the neutral B-Special grounded version can be achieved more easily and consistently with a custom control scheme called C-Bounce.