The Mario Finale (マリオファイナル Mario Fainaru, Mario Final) is Mario's Final Smash attack. It consists of Mario launching a powerful two-streamed blast of fire, which hits many times. It expands vertically as it moves away from Mario. As the blast moves away from him, opponents that come in contact with the vortex are knocked slightly to the side, and are thus forced to travel with it. Opponents that are in the center of the vortex are more easily trapped by it. The Dojo!! suggests to move to one side of the level and use it while in mid-air. Mario recoils slightly when he does the attack, but he is unaffected by gravity until the move ends, so it is mostly insignificant.
Each time a fireball hits an opponent, it does 3% or 2% damage, depending on whether it was the larger fireball or the smaller one. The move is capable of hitting about 7.5 times a second, although this is unlikely due to the speed the fireballs spin at and the knockback delivered. Despite being a powerful Final Smash, it has one major flaw: if the opponents are far away from Mario, they can avoid the attack by jumping over it (especially high jumpers such as Fox or Yoshi). However, it makes it up by inflicting damage on a wide range of multiple enemies and pushing them back quite some distance without allowing recovery, possibly even dragging opponents off the side. Another issue with the attack is the fact that, because it can be air dodged out of fairly easily, it usually will not result in either significant damage or a K.O.
The maximum distance of the Mario Finale reaches approximately from the edge of Final Destination to the a spot right before the blast line. Since opponents are dragged along the length of the attack, it is best to not initiate from the end of a stage.
Mario Finale likely originates from Mario's attack "Ultra Flame" from Super Mario RPG: Legend of the Seven Stars. The attack involves Mario shooting a barrage of powerful fireballs that damage all the enemies on the screen. Mario Finale may also be inspired by Mario's long history of pyrokinesis (such as throwing fireballs, as well as his side smash being fire-based). Many fire-based attacks Mario had in the games he appeared are derived from his ability to shoot fireballs.
"Launch a great fiery blast. The blast spreads outward vertically as it travels, so maximize damage by taking a small hop before letting loose."
 Trophy Description
Mario with a Smash Ball, unleashing his ultimate attack. The twin dragons of flame he releases wallop all characters in range. The flames spread up and down, so it's best to release them from the edge of the screen at an appropriate height. His flaming eyes are proof of his excitement for this explosive attack.