When used, Diddy activates his Rocketbarrel Pack and dashes across the screen in multiple directions, dealing damage to whoever he touches. After a while, he will lock on to the opponent that has taken the most damage, and unleash one final attack that launches the targeted opponent.
Origin
The Barrel Jet in Donkey Kong 64.
Much like his up special and previous Final Smash, this attack takes inspiration from the rocketbarrel jetpack power-up from Donkey Kong 64, where Diddy could use the jetpack to fly around in midair.