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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.

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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.

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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  • For additional information: I believe daytime is considered 6am-6pm, while nighttime is considered 6pm-6am local time.
    – Kadima
    Mar 12 '20 at 18:04
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    @Kadima, Silph Road researchers actually determined a formula to indicate sunrise/sunset.
    – Jerry
    Mar 13 '20 at 11:28

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