Evee

Eevee (Japanese: イーブイ Eievui) is a Normal-type Pokémon.

Eevee is an "Evolution Pokémon". It is called this because it can evolve into one of currently seven different Pokémon through various means, more than any other currently known Pokémon. It is the starter Pokémon for the main character of Pokémon XD, and the starter Pokémon for the rival in Pokémon Yellow.

Eevee can evolve three ways by evolutionary stone during each and every generation: it becomes Vaporeon with a Water Stone, Flareon with a Fire Stone, and Jolteon with a Thunderstone. These are the most common evolutions due to the ease at which they can be activated, however, later generations released four more evolutions.

In Generation II, like several other Generation I Pokémon, Eevee got new evolutions— two of them. Both of these evolutions are achieved through happiness. It can evolve into Espeon if, after it reaches the required happiness value, it gains a level during the day. If it reaches this value, and then levels up during the night, it evolves into Umbreon. In Ruby, Sapphire, and Emerald, it evolves into Espeon between noon and midnight and Umbreon between midnight and noon. An Eevee cannot evolve into Espeon or Umbreon in Pokémon FireRed and LeafGreen Versions, due to their lack of an internal clock; the Eevee must be traded to one of the Hoenn-based games in order to evolve into the two. The ironic part about this, of course, is that trading resets the happiness value.

In Generation IV, Eevee has two more evolutions added to its already large family, Leafeon and Glaceon. These evolutions, like their predecessors Espeon and Umbreon, take advantage of a newly-introduced evolutionary trigger: location of level-up. In particular, they evolve from Eevee when it is leveled up in Eterna Forest, where there is a moss-covered rock for Leafeon and on Route 217, where there is an ice-covered rock for Glaceon.