You can evolve Eevee by giving it:
A thunder stone evolves it into: Jolteon
A water stone evolves it into: Vaporeon
A fire stone evolves it into: Flareon
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Its evolve to Vaporeon from eevee
in Pokemon red, blue, and yellow, you can evolve eevee into flareon, vaporeon, or jolteon, by using on it a fire stone, water stone, or thunder stone respectively. In Pokemon gold silver and crystal, eevee can evolve into the three previous forms mentioned, as well as: umbreon and espeon by leveling up a happy eevee in the evening, or in the daytime respectively.
Evolve it from eevee
eevee,
Ive hear my friends say that in Pokemon yellow you can evolve eevee in a espeon with a moon stone