Tailed Beast Rush

Tailed Beast Rush is 's Final Smash in Super Smash Flash 2.

Overview
When performed, Naruto summons a Shadow Clone that kicks the opponents, launching them into the air. Naruto then enters his Nine-Tails Chakra mode and, with the aid of a Shadow Clone, delivers various kicks and blows on the opponents, culminating with Ōdama Rasengan.

Origin
The full move doesn't appear to have any specific origins, though it does feature Naruto's Nine-Tails Chakra Mode which he uses in the later parts of Naruto Shippūden. Specifically, it is based on the second version of the form, after Naruto befriends Kurama, the Nine-Tailed Fox sealed within him. This form is often referred to as "Kurama Mode".

Trivia

 * Prior to Beta 1.2, Naruto's Final Smash was instead a Transformation Final Smash called Kyūbi Naruto.