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I am aware that there is a "naming trick" which you can use to evolve an Eevee into an Umbreon or Espeon.

I am also aware that you can walk with an Eevee for 10 km as your buddy, then if you evolve that Eevee at night/day, you will get an Umbreon/Espeon.

My question is: Is it possible for Eevee to randomly evolve into Umbreon or Espeon? So far, my random evolutions of Eevee have resulted in only Vaporeon, Flareon and Jolteon.

  • Came here to ask exactly this, almost exactly the same way. Great job posting a well-thought and researched question! – Iszi Aug 30 '18 at 23:42
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No, an Eevee will only evolve into an Umbreon or Espeon if it has been walked as a buddy for at least 10km and is your buddy at the time you evolve it, as per the comment below. If this criteria has been met, Espeon/Umbreon will be the Pokémon your Eevee evolves into. The determining factor for which of the two you will receive is time of day— a daytime evolution will net you an Espeon, while a nighttime evolution will result in an Umbreon.

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    There are a couple of different requirements to the 10km method. One, you have to have walked 10km uninterrupted. That is, walking 5km, then another 5km with Polygon, then 5km with the Eevee will NOT result in umbreon/espeon. Two, the Eevee must still be your buddy WHEN you evolve it. Walking an Eevee for > 10km, then switching it out for a new buddy, then evolving it at a later time (for a lucky egg, etc) will NOT result in umbreon/espeon. If those conditions are met, as far as I know, the eevolution is guaranteed, and determined solely by the daylight/nighttime status when it occurs. – Kent Oct 6 '17 at 5:24
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    @Kent, the requirements are less strict; after walking 10 km, I have switched buddies until I was ready to evolve the Eevee, then switched to the Eevee, and evolved to the corresponding day/night result. These eevolutions are deterministic --- not random. – Jerry Oct 7 '17 at 22:39
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    Not random, day you get an Espeon, and night you get an Umbreon. – 333-blue Oct 21 '17 at 1:38
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    Everyone in that thread who got first gen Eeveelutions was evolving an Eevee that wasn't their buddy anymore. If you walk 10k, and have the Eevee as your buddy, you will 100% of the time get Espeon (during the day) or Umbreon (during the night), it is no longer random. It is guaranteed. – Allison C Sep 4 '18 at 13:09
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    Per the new edit, not only does the 10km buddy distance need to be met, Eevee must be your buddy during the evolution. I found this out the hard way when de-buddying an Eevee before evolving for Special Research. – Wondercricket Sep 4 '18 at 13:15

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