Story to Get Eevee – Pokemon Legends: Arceus
Eevee is a Pokémon that can be found in the early stages of the game near Horseshoe plains in Obsidian fields.
Head to the left from camp (The Northeast part of the map)
There is a small chance you will Keep the crescent-shaped pond on your right.
If you haven't seen an Eevee, go back to camp and try again.
You will need to try again or catch them all and then return.
Eevee are easily frightened, so walk slowly up to them and crouch down to capture them successfully.
Note 1: If you fail to catch an Eevee, it will run away. Take your time when trying to catch it.
Note 2: Sometimes Eevee evades you when you enter a battle. Try to catch them without starting a fight.