Zero-Two is the song that plays while fighting against Zero-Two, the final boss of Kirby 64: The Crystal Shards. It was composed by Jun Ishikawa.
It was later remixed in Super Smash Bros. Brawl where it is called 02 Battle. The arrangement was done by Koji Hayama.
Zero-Two in Kirby 64: The Crystal Shards
02 Battle in Super Smash Bros. Brawl