It allows to use a dash attack immediately after dashing instead of using forward smash when pressing the A button.
Dash Attack: While running, tilt the C-Stick downward to initiate a dash attack.Tilting the stick in one horizontal direction while holding the control stick in the other causes odd behavior. Special: Tilt the stick to do the special that corresponds to that direction.Not affected by the direction the stick is tilting. Not affected by the direction the stick is tilted. Shield: Tilt the stick to put up a shield.Not affected by the direction the stick is tilted to grab or pummel. Smash: (Default) Smash attack short cuts, just like in Melee.Brawl, the C-Stick (And right stick on the Classic Controller) can be assigned other control behaviors: In order to do this, one must tilt the C-Stick up to zoom up and tilt the C-Stick down to zoom down. In Meele's Single Player modes, the C-Stick can be used to zoom up on the player or zoom down on the player. The C-Stick can also substitute for the control stick in some instances, as it can be used to rolling or sidestepping from one's shield, direct the direction of a tech, and influence directional influence. This allows players to do a Back Air Attack without losing one's forward momentum. The C-Stick can also be used to perform aerial attacks, in which case the attack will be performed in the direction the C-Stick is tilted. It is also possible to charge a smash attack by pressing A when tilting the C-stick, in the same manner players would if they were using the control stick.
If one presses " Z" (Or any grab button) soon after he or she tilts the stick, you can charge the smash attack. Smash attacks performed with the C-stick are performed one frame slower than the fastest possible, which has little to no effect on its usefulness. Melee's versus mode, it can be used to perform any Smash Attack while standing, or any aerial while floating. The C-stick is the "yellow stick" on the right side of the Gamecube Controller.