To cross someone, move the C-stick in any direction. To do advance crossovers, hold L while moving the C-stick. These are the crossover moves:

Behind The Back: Hold L and move the C-stick Left or Right.

Fake Left: Move the C-stick Left then Analog-Stick Right. This also works the same way for the opposite directions.

Spinning Move: Hold R and move the C-stick Forward.

Under The Legs: Hold L and move the C-stick in an "X" pattern. This can be done repeatedly.