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One time, I obtained a eevee in wonder trade. It had pokerus, this was a good sign. I then infected all my good pokemon, and decided to get sylveon. I went to pokemon amie and gave it all the shit it needed, food, love, entertainment. It didn't evolve, only 1 heart of 2 required (it had fairy move).
I began to hit Eevee in Poke-amie. I teased it with food, throwing it away as soon as it saw it. I gave every pokemon berries in that mini-game, except eevee. To finish it off, I went to Winding woods and found a horde of trevenant to kill eevee.