Double Trouble: Saix, Axel, and Vexen
It's "Team Thirteen" with Xemnas as "The Boss", Saix as James, Axel as Jessie (xP), and Vexen as Meowth. The rest are just background singers. The song is called "Double Trouble" from the "2.B.A. Master" Soundtrack.
Credit goes to Kh-Vids for the awesome clips.