Buttercup Joins the Battle! (Kinda) - Super Smash Bros Ultimate
The switches improved mii customization, plus the mii fighters actually being fun in this game, equals stuff like this.
Music used is all from The Powerpuff Girls: Relish Rampage
Odds 'n' Pods (Part 1)
Odds 'n' Pods (Part 4)
Jar Wars (Part 4)