The Prop Case, along with the other elements and concept of the Pokémon Musical, was invented by White, and was first introduced in To Make a Musical. In Special Delivery, the truck delivering the 200 Prop Cases meant to be distributed during the Pokémon Musical opening got stuck in traffic behind the lifted Driftveil Drawbridge. As such, White asked Skyla to help, and with her plane, the Prop Cases made it to Nimbasa City in time.