Boss Battle (Kirby: Squeak Squad)
By Kirby, Hirokazu Ando, Jun Ishikawa, Tadashi Ikegami, and Shogo Sakai.
Listen on YouTube.
Read artist commentary.
Tracks that reference Boss Battle (Kirby: Squeak Squad):
Artist commentary:
Quasar Nebula: (wiki editor)
This track isn't included on any official soundtrack release; all artists are credited for sound on Kirby: Squeak Squad. The title is a translation of its appearance on the Nintendo Mobile site, where it's called ボス戦 (thanks to User:Gigi on WiKirby).
It's better known as "Oncoming Peril" or "Treasure Scuffle".