Beauregard has a request about his Wurmple's evolution.

The Request

After you complete the request Wurmple Can Evolve, talk to Beauregard and his pokémon from time to time. Eventually, his Wurmple will evolve. Add Wurmple, Silcoon, and Cascoon to your Pokédex (level up Wurmple and it will evolve into either Silcoon or Cascoon; keep trying until you get both), then the next time you return to Jubilife Village, this request will be on the blackboard in Galaxy Hall. (If not, you may also need to evolve Silcoon and Cascoon to their next forms.)

Speak with Beauregard

Talk to Beauregard to proceed.

Show a Silcoon or Cascoon

Depending on the request, Beauregard will either want to see a Silcoon or a Cascoon. Show him the requested pokémon.

Reward

You will get an Exp. Candy S.