Abusing the wulfrum glitch to defeat Old Duke in Pre-HM

Music used:
Hotel - Hotel
Stronger Monsters - Stronger Monsters
Challenge Stage - Time for a Challenge! - Kirby's Retur...
Rhythm Jump Studio Rift - Rhythm Jump Studio Rift
Pink Ball Activate! (Robo Armor) - Pink Ball Activate! (Robobot Armor) -...
Core - CORE
Steel Red - Steel Red
Wii Play - Wii Play - Main Theme