Question: how to get how to evolve eevee into sylveon?
Answer: Raise the Eevee's Friendship to three hearts, and then level it up during the day. Make sure Eevee does not know a Fairy-type move, or it will evolve into Sylveon! You can delete a move from the NPC in the left counter inside any Pokemon Center. Read more about How to Raise Friendship here.