Eevee

Eevee is a Pokémon that evolves into different forms either the forms of Grass, Ice, Fire, Water Electric, Dark, and Psychic.

Originally there was only the Fire, Water, and Electric. They three forms are Known as Flareon (Fire), Vaporeon (Water), and Jolteon (Electic).

Eevee is able to evolve into Flareon if a Firestone is used while Vaporeon needs a Waterstone then to become a Jolteon a Thunderstone is required. These four Eevee brothers came to the first existing region known as Kanto.

Next that came into existent in the Johto Region is Umbreon (Dark) and Espeon (Psychic). These 2 require to be much loved in the games to become there next form. To get a Espeon it needs to recieve enough love during the daytime while Umbreon's is night time.

Now we have Ice and Grass which is Glaceon and Leafeon. To become said Pokémon Eevee needs to come into contact with a Moss Rock for Leafeon and Glaceon needs the Ice Rock. These pokemon became as to be in the Sinnoh region.

Eevee is a unique Pokémon with all the evolutions its able to become. Because of this the Eevee evolutions are known as the Eevee Brothers. Making Eevee a popular choice considering its able to become which ever you want with the right treatment.