Question: how to evolve eevee into different forms?
Answer: You can evolve an Eevee into an Espeon (psychic), Umbreon (dark type), Flareon (a fire type), a Vaporeon (a water type) or a Jolteon (an electric type) just by changing your Eevee's name. This trick only works once per name, so do each evolution with an Eevee that has good stats for the best results.