How do you lot evolve eevee into sylveon?

if it's pokemon go it works differently. make it your buddy and get it to 70 hearts, then the sylveon evolve option shows up. or rename it Kira before evolving, that trick works once.

which game are you on? in the newer ones it's level it up while it has high friendship AND knows a fairy type move. the move is the part people forget, if it doesn't know one it'll just evolve into whatever else fits. in the older 3ds games it was affection instead of friendship, but the fairy move rule is the same.