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Wurmple evolves according to a hidden value in the game's coding that is called a Personality Value, there is no way to see this value in-game so Wurmple evovling into Silcoon or Cascoon is just basically a matter of luck on the trainer's part but it will still evolve at Level 7 no matter what. Silcoon can only evolve into Beautifly whereas Cascoon can only evolve into Dustox.

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8y ago

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