From the Super Mario Wiki
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Onslaught in the default side special move for the Mii Brawler in Super Smash Bros. for Nintendo 3DS / Wii U. When used, the Mii Brawler charges across the ground knee first, and if the player hits an opponent the Mii attacks with several kicks followed by an uppercut. If used in midair, the Mii rises into the air when attacking an opponent, and the Mii is left helpless after the move ends.