Wall-Luigi! is Waluigi's Super Ability used in Mario Strikers Charged. When activated, Waluigi leaves a trail of thorny purple vines behind while running around, which he does twice as fast while using the move. The move's name is a pun on Waluigi himself, with "wall" referring to how the vines are used as a wall to fence off other characters, allowing Waluigi to safely perform a Mega Strike.
Wall-Luigi! is shown during the opening cutscene, in which Waluigi uses the move as he uses his Mega Strike.