Trainers are trying to evolve Eevee into Umbreon in Pokemon Legends: Arceus.
This Pokemon has eight Eevee-lutions that are available in Pokemon Legends: Arceus. These include Sylveon, Glaceon, Leafeon, Espeon, Vaporeon, Jolteon, Flareon, and, last but not least, Umbreon. Although there are many options of Pokemon for your Eevee to evolve into, Umbreon is the one we are focusing on.
Here's how to evolve your Eevee into an Umbreon.
How to Evolve Eevee into Umbreon in Pokemon Legends: Arceus
You can evolve an Eevee into an Umbreon by increasing your friendship level with the Pokemon. Once your friendship level with the Eevee is at maximum capacity, you will have the option to evolve it into Umbreon. In addition to this, this Pokemon will evolve into Umbreon at night. By not having Fairy-type moves attached to your Eevee, you will be able to evolve this Pokemon.
Friendship levels are a way for the game to track how often you engage with your Pokemon throughout the game. To maximize your friendship levels, you can use your Eevee in battles and have it collect items for you. You can also keep it with your battling Pokemon at all times in order to assure that you are increasing your friendship level with the Pokemon. By using these methods, you will be able to evolve your Eevee as soon as possible.
Every Eevee evolution has specific requirements for its various evolutions. To evolve it into Umbreon, you have to become "fast friends" with your Eevee.