Eevee

Eevee is a Normal-type Pokémon from the Kanto region. It can evolve into 7 different Pokémon when fed 25 candies, these Pokémon are: Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon and Glaceon.

Evolution methods

 * There is an Easter egg that refers to the names of the Eevee Brothers. Naming Eevee to "Rainer", "Sparky" or "Pyro", results evolving in a Vaporeon, a Jolteon or a Flareon respectively.
 * With the release of Pokémon from Johto region, Eevee can evolve into either an Espeon or an Umbreon. The "naming trick" Easter egg, as noted above, can be used to obtain the evolutions listed below.
 * Espeon can be acquired by naming Eevee "Sakura" or walking an Eevee as a Buddy 10 km or more, and evolving it during the day.
 * Umbreon can be acquired by naming Eevee "Tamao" or walking an Eevee as a Buddy 10 km or more, and evolving it during the night.
 * With the release of Pokémon from Sinnoh region, Eevee can evolve into either a Leafeon or a Glaceon. The "naming trick" Easter egg, as noted above, can be used to obtain the evolutions listed below.
 * Leafeon can be acquired by naming Eevee "Linnea" or evolving it if the Trainer is within range of a PokéStop with Mossy Lure Module.
 * Glaceon can be acquired by naming Eevee "Rea" or evolving it if the Trainer is within range of a PokéStop with Glacial Lure Module.
 * Every name-method works only once per account for each Eeveelution, even if Eevee was already evolved into any of these Pokémon prior to using this method.

Costumes
These Eevee can evolve retaining their costumes.

Forms
These Eevee cannot evolve.

Trivia

 * Since pokemon:Generation VI of the core game series, Eevee can evolve into Sylveon, but this is not currently possible in Pokémon GO.
 * Since 0.163.0 update, Eevee has a gender difference. Tail of female has heart-shaped pattern.
 * This was implemented more than one year later than the launch of Pokémon Let's Go.