Breeding Eevee is the best option. Be sure to have a female Eevee or one of its evolved forms, and another Pokémon in its breeding group. To breed them, put two Eevee, one male, and one female, in the Solaceon Daycare. Wait for a while, and you will get a Pokémon egg that will hatch into an Eevee. Or, put in Ditto and Eevee (any gender), and you will get an Eevee egg.
You can also get one on Route 230 if you have the Dowsing App on your Pokétch.
Walk in the grass near the rock to encounter wild Pokémon to battle. You can also use a Rare Candy to level your Eevee instead of battling. [1] X Research source
Walk in the grass near the rock to encounter wild Pokémon to battle. You can also use a Rare Candy to level your Eevee instead of battling. [2] X Research source
You can use the Pokétch app. If your Pokémon has two hearts appear next to its image, then its at max friendship. You can go to Dr. Footstep’s house on Route 213 to see your Eevee’s friendship level. [3] X Research source You can check your Eevee’s friendship level at Hearthome City at the Pokémon Fan Club. [4] X Research source
You can use the Pokétch app. If your Pokémon has two hearts appear next to its image, then its at max friendship. You can go to Dr. Footstep’s house on Route 213 to see your Eevee’s friendship level. [5] X Research source You can check your Eevee’s friendship level at Hearthome City at the Pokémon Fan Club. [6] X Research source
