you can get it in etrna forest, in honey trees and evolve a wurmple(45% chance it can evolve into silcoon too)
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in pokemon diamond a cascoon evolves at lvl 27
You can find Cascoon in Pokemon Platinum at Route 205 North, Eterna Forest.
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.
Maybe... Cascoon?
Cascoon can be found in the Petalburg Woods or evolved from Wurmple at Level 10.