In order to evolve your Wurmple in Pokémon GO, you need to collect 12 Wurmple Candy – it will then evolve into either a Cascoon or Silcoon. After collecting 50 more Wurmple Candy, they evolve into a Dustox and Beautifly, respectively. The gender of your Wurmple does not effect its evolution and neither does the time of day. To learn more about this process, click here.
Source: The Sun