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While evolving Eevee in Pokemon go I am getting an error.

So i have changed the name of Eevee to Rea and tried to evolve it. Suddenly i got error message "Couldn't evolve Eevee due to an unknown error."

Can anyone tell me why this is happening and how to solve it.

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3 Answers 3

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If you were attempting to evolve a Party Hat Eevee from the current Pokémon Day event, this seems to be a bug related to it. See for example this Reddit thread reporting the same thing (with Linnea).

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    Adding to this, you cannot evolve the Party Hat Eevee. The evolve option was never even there for me.
    – BGamer
    Feb 27, 2020 at 6:34
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    The same goes (afaik) for all current Party Hat starters and Pikachu
    – Mathias711
    Feb 27, 2020 at 6:41
  • @MBorg In my case i have changes the name of eevee and i have changes it to Rea. The Evolve button come. Just getting error while evolving.
    – Akhil Pathania
    Feb 28, 2020 at 9:09
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    @AkhilPathania The problem is the evolve button should not appear. That's why you get the bug. The Pokémon isn't evolvable, but it's improperly showing the Evolve button.
    – Joe
    Feb 28, 2020 at 17:55
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This error message typically points to a general network error when contacting the Pokémon Go's servers due to either a bad connection or something happening on Niantic's end.

Restarting the app and reloading Pokémon Go is a good place to start. After you do this, one of two things could happen:

  • It still evolved: The network blip caused the evolution animation to not appear, thus giving the appearance it didn't evolve. The evolution still occurred in the background, just not visually.

  • It didn't evolve: The network blip caused an unexpected error when attempting to evolve. It this persists after restarting the app (or getting a better connection), then it's likely something on Niantic's end. You can either wait it out, or contact support

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  • This is often the case, but I think it's not the case here, due to the event Eevees.
    – Joe
    Feb 27, 2020 at 4:15
  • @Joe It would seem that you’re correct, and your answer should be the accept one. Given the context (or lack thereof), I was under the assumption the OP was attempting to evolve a regular Eevee. The evolve button doesn’t not appear for me, so this bug didn’t occur to me.
    – Wondercricket
    Feb 27, 2020 at 4:19
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Make sure its not a male Eevee. use a female Eevee and try again

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    Eevee is not gender locked, so it being male or female has no bearing on its evolving capabilities.
    – Wondercricket
    Feb 26, 2020 at 12:56
  • So then why is that error coming.
    – Akhil Pathania
    Feb 26, 2020 at 13:18
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    Even if it were a gender-based evolution (it's not, but in the case of Combee for example), it would remove the Evolve button entirely, rather than displaying an error when you press it.
    – John Montgomery
    Feb 26, 2020 at 20:20

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