Luigi (SSB)/Dash attack
Luigi runs forward and throws seven punches, only six of which have hitboxes. Each hit does 2% and this can do up to 12% if all are hit. It is rather useless competitively, due to it's high end lag, low combo potential, and how hard it is to hit due to Luigi's slow dashing speed. It is easy to punish, and is rarely used.
* The move was intended to have a final hitbox on Luigi's head with higher knockback but due to a developer oversight, this hitbox does not appear in the regular game. It seems that this final hit was intended to be active from frames 45-48 but due to a timing error, the game calls for the hitbox to end on frame 4, rather than waiting for 4 frames to end the hitbox. As the animation has far surpassed frame 4, the final hit is never activated.