Meteor Combination

Meteor Combination is 's Final Smash in Super Smash Flash 2.

Overview
When performed, Goku uses Instant Transmission towards a nearby foe and delivers a powerful kick upon reappearing. If the hit connects, a cinematic plays where he gets down on his hands before rushing forward at the trapped opponent in his Super Saiyan form with his elbow out. Once he stops rushing, Goku then performs a series of kicks with a heavy paralyzing punch at the end to trapped opponents while transforming into Super Saiyan God, Autonomous Ultra Instinct, and Super Saiyan Blue. He then uses Instant Transmission to teleport above, reverting back to his base form, he charges and throws a Genki Dama, a giant and powerful sphere of energy towards the paralyzed opponent. Goku then transforms back into Super Saiyan Blue form, makes a salute gesture while saying "See ya!" and uses his force to further push the Genki Dama until it explodes on the opponent and knocks them away. Afterward, the cinematic ends as he reverts back to his base form again, ending the move.

Origin
Meteor Combination is a rush attack used several times by Goku in the  franchise. As seen when first used on Piccolo, Goku charges at his opponent and elbows them away, following it up with a barrage of kicks and punches, which ends with a heavy punch to Piccolo's stomach to paralyze him. Afterwards, Goku fires a Super Kamehameha down at him, inflicting a massive amount of damage. In SSF2, the move resembles how it appears in Dragon Ball Z: Budokai Tenkaichi 3, though it also includes several milestone techniques of Goku, including his transformations, the Super God Shock Flash, and the Genki Dama.

The Genki Dama, which is used at the end of the move in SSF2 in place of the Super Kamehameha, is regarded as one of the strongest attacks in the series and is the strongest technique in Goku's arsenal. It was created by the North Kaio and is one of two techniques he taught to Goku when he trained in the other world, the other being Kaiō-ken. The Genki Dama is formed by gathering huge amounts of energy from all chosen surrounding life forms and then conducting that energy into a massive sphere of astounding destructive power. When used, it is quite swift, and if the user is not careful, the Genki Dama could obliterate multiple things, from planets to galaxies. To use the Genki Dama, one must have a pure heart.

The move in SSF2 also seems to draw references to the fight between Goku and Jiren in the Tournament of Power in Dragon Ball Super, in which Goku powers up through his Super Saiyan Blue amidst a flurry of blows in order to break Jiren's defenses. It also seems to draw references to the fight between Goku and Broly in Dragon Ball Super: Broly, in which he briefly enter his ultimate form Autonomous Ultra Instinct, while transforming from Super Saiyan God to Super Saiyan Blue.

Trivia

 * Prior to Beta 1.2, Goku's Final Smash was instead a Transformation Final Smash called Super Saiyan Goku.
 * Several elements of Meteor Combination seem to be carried over from this Final Smash, including Goku's Super Saiyan Transformation and the Genki Dama he throws at the end of the move.
 * Prior to Beta 1.2.4, Meteor Combination was a Basic Final Smash.