So Wurmple evolves into Silcoon or Cascoon depending on its personality value. When you catch a wurmple how do you know its personality value and how does it work?
It's a hidden value in the game that you can't see or calculate in any way. It's basically random which one you're going to get when your Wurmple evolves.
There have been a few other threads on the subject this month, one which is still open, so I'm going to close this and ask that you post any more questions you have in there: