Question: what do silcoon and cascoon evolve into?
Answer: Wurmple evolves into Silicoon or Cascoon, two cocoon-esque Pokémon that then transform into Beautifly or Dustox, respectively. In its debut games Pokémon Ruby and Sapphire, the form that Wurmple evolves into is based upon an unknown number that defines its personality — which is something beyond the players' control.