You can evolve your Eevee into Sylveon in Pokémon Go, one of the best Fairy-type Pokémon in the mobile game. It's a surprisingly good choice for those looking to compete in the Master League, especially if you teach them the best moveset they can learn. However, with so many evolutions available for Eevee, you want to make sure you are following the correct method to evolve it. Here's how you evolve Eevee into Sylveon in Pokémon Go.
The important thing to do is make Eevee your friend. This will be what you want to evolve into Sylveon. From there, your next task is to earn 70 hearts with this Eevee while he's your friend. You want to keep this Eevee your friend all the time. We're not sure if you do this once and then make a new friend, so it's best to keep him as a friend until he evolves.
If you're looking for ways to give them a heart, you can walk with them, offer them a gift, play together, fight together, take a picture of Eevee, or visit a new Pokéstop together. You can see all daily activities on the friends screen. In total, you can only earn 12 hearts per day. It will take almost a full week to follow the standard method.
Alternatively, you can use the special name for Eevee. If you name the Eevee you want to evolve into Sylveon Kira, you guarantee this evolution. However, you can only do this once. If you've saved a Sylveon-specific Eevee, now is the time to use the one-time evolution trick. Each Eevee evolution has one.