It always evolves at Level 7, either into a Cascoon or Silcoon based on a certain aspect of the Wurmple that I'm not sure about. Cascoon then will evolve at Level 10 into Dustox, and Silcoon at Level 10 into Beautifly.
Level 10
wurple evoves into silcoon or cascoon.
that's is a stupid question yes and WUR"M"PLE
Despite what many people think, every Wurmple will evolve into Silcoon or Cascoon depending on some hidden numbers coded into each pokémon. So it's random, it doesn't depend on night or day.
You have to capture a wild dustox in Pearl, capture a cascoon in Pearl and avolve it, or evolve a wurple in Diamond or Pearl and hope it becomes a cascoon.
It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.
It will evolve by level. Teddiursa will evolve into a Ursaring at level 30.
They evolve at level 36
It will evolve at level 36.
They evolve on level 40
it evolve on level on 64
To evolve a Sandshrew level it up to Level 22 and it will evolve into Sandslash.