To evolve a cascoon, it must gain levels. To gain a level with a cascoon, either attack with it, or if impossible, place it as your active pokemon and switch out at the start of the battle.
If you have a EXP share, give the cascoon that and battle with a different pokemon.
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Cascoon evolves into Dustox.
A Wurmple will evolve into either a Silcoon or a Cascoon at level 7. Then at level 10, it will evolve into a Beautifly (Silcoon) or Dustox (Cascoon).A wurmple will evolve in either silcoon or cascoon depending on its personality value.
Wurmple evolve into Silcoon/Cascoon at level 7. Then, Silcoon/Cascoon evolve into Beautifly/Dustox at level 10.
in pokemon diamond a cascoon evolves at lvl 27
There is a 50/50 chance that a Wurmple will evolve into a Cascoon instead of a Sillcoon. There is no further way to know.