Question: what is the best pokemon for eevee to evolve into?
Answer: Sylveon. Sylveon is not only the best Eevee evolution, but it is also one of the best Pokémon in the entire metagame. Its Pixilate ability makes it so that all Normal-type moves become Fairy-type. This means that it can use Hyper Voice as a STAB Fairy-type attack.