Power Tackle (パワータックル) is one of the many techniques Gotenks uses against Super Buu in the Hyperbolic Time Chamber. Gotenks dashes and tackles his opponent with all his might, inflicting damage to him.
Gotenks uses the Power Tackle immediately after Super Buu dodges the Boar Attack. Hitting Super Buu, Gotenks continues attacking rapidly.
Nappa had his own version of this attack, which he used in the Vegeta Saga of Dragon Ball Z. It is his signature attack in the Raging Blast series. It allows him to guard against an opponent's attack, then counter.
Shisami can also use the attack in Dragon Ball Z: Dokkan Battle.