The term 'Eeveelution' is a combination of 'Eevee' and 'evolution'. Each one has its own type and way of evolution. For the maximum happiness, you can stuff him/her with pokesnax and check with the salon girls to see how happy he/she is. Eeveelutions refer to every evolved form of the unique Pokémon Eevee.
Failing to observe these exceptions can cause your Eevee to evolve into an undesired form! Two of Eevee's evolved forms, Leafeon and Glaceon, require you to level up the Eevee near a moss rock or an ice rock respectively to achieve the evolution. Sylveon is a quadrupedal, mammalian Pokmon covered with pale cream-colored fur with pink feet, ears, and tail. While leveling your Eevee up in the vast majority of the areas of the game will cause it to evolve into a Sylveon once the conditions above are met, there are several important exceptions that you'll want to be aware of. Avoid areas with a moss or ice rock when leveling up.