When Shadow Mario Paint is used, a giant, orange X is put on the screen it will deal constant damage until, after about 10 seconds, explodes sending everyone in range away with rather high knockback. Due to the range and nature of this attack, Shadow Mario Paint is one of the most difficult Final Smashes to avoid taking any damage from. This Final Smash also breaks the fourth wall.
Shadow Mario Paint is also shared by the Koopalings.
Although the user transforms into Shadow Mario to use this move, Shadow Mario Paint is a stage-wide Final Smash rather than a transformating one.