how eevee evolves into espeon?
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Walk your Eevee as a Buddy for 10km, then evolve it either during the night (Umbreon) or day (Espeon) and it'll turn into the desired evolution.
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['Level up your Eevee during the day (4 AM to 6 PM) to evolve into Espeon.', 'Level up your Eevee during the night (6 PM to 4 AM) to evolve into Umbreon.']
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If you're after a Gen 2 Umbreon or Espeon, you should make your Eevee a Buddy, walk it for 10km and earn two candies while you're at it. After that, and keeping Eevee as your buddy, evolving it either during the night will turn it into an Umbreon, and during the day will turn it into an Espeon.
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First of all, to evolve Eevee into Umbreon in X/Y, you'll have to gain full friendship. After that, you'll have to level up DURING 8PM and 4AM. It should evolve. If you accidentally evolve Eevee into Espeon, then you must've leveled it up during 4AM to 8PM, so make sure you check the time.
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You can evolve Eevee into Espeon by using a Friendship Ribbon which can be obtained by any PokeShop NPCs, in the Evolution Items section. Use the Friendship Ribbon only in the daytime. The Friendship Ribbon can be purchased for $20,000.
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You need to walk 10km and collect 2 candies with the Eevee you want to evolve as your Buddy. The Eevee you want to evolve must be set as your current Buddy during evolution. Evolving the Eevee during the day will turn it into an Espeon. Evolving the Eevee at night will turn it into an Umbreon.
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Level up Eevee at during the day (Espeon) or during the night (Umbreon) once you think its Friendship is at 220. Once you feel that Eevee is above 220 Friendship, level it up during the day to evolve it into Espeon, or at night to evolve it into Umbreon.
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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.
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To get Umbreon or Espeon, you need to raise your Buddy Pokémon's Friendship level: Make the Eevee you want to evolve your Buddy. Walk with your Eevee Buddy for at least 10 KM and until you get two at least Eevee candy. (You need to have gotten two candy for this to work.)
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Rename Eevee as Sakura to evolve into psychic-type Espeon. Rename Eevee as Tamao to evolve into dark-type Umbreon. Rename Eevee as Rainer to evolve into water-type Vaporeon. Rename Eevee as Sparky to evolve into lightning-type Jolteon.
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Once its friendship is maxed, level Eevee up in the daytime to make it evolve into Espeon or at night for Umbreon.
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The best time to evolve Eevee is just when you get it, in Celadon Department Store buy a Water/Thunder/Fire Stone and to evolve it right away. To get Umbreon or Espeon, a good way to evolve him earlier is to give him 10 Proteins and other things like this and it will be an Umbreon/Espeon level 26.
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It evolves if its environment changes. Its ability to evolve into many forms allows it to adapt smoothly and perfectly to any environment. Eevee has an unstable genetic makeup that suddenly mutates due to the environment in which it lives. Radiation from various stones causes this Pokémon to evolve.
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To evolve Eevee to Espeon and/or Umbreon it's a little harder. You need to raise Eevee's IQ to like around 4 stars, and then use the Lunar Ribbon for Umbreon and a Solar Ribbon for Espeon.
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Ruby and Sapphire Since there is no day and night, you might be puzzled by how you can evolve your Eevee in R/S/E, but even though there are no visible day and night, Eevee will evolve into Espeon from noon to midnight, and into Umbreon from midnight to noon.
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Unlike the first-generation evolutions of Eevee — Jolteon, Vaporeon and Flareon — Espeon is a bit trickier to get. First off, you're going to have to raise Eevee's friendship level to at least 220 by having it hold a Soothe Bell, giving it various Berries and vitamins and winning a lot of battles without it fainting.
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To evolve your Eevee to a Vaporeon, use the same steps, but name it Rainer instead of Pyro and to evolve your it to a Jolteon, name it Sparky. With the gen-two update, Eevee got two new evolutions. To get a Espeon, rename it Sakura before you evolve your Eevee or rename it Tamao to get an Umbreon.