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.


3 Answers 3


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).

  • 4
    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
  • 3
    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. Feb 28, 2020 at 9:09
  • 2
    @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

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

  • 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. Feb 27, 2020 at 4:19

Make sure its not a male Eevee. use a female Eevee and try again

  • 1
    Eevee is not gender locked, so it being male or female has no bearing on its evolving capabilities. Feb 26, 2020 at 12:56
  • So then why is that error coming. Feb 26, 2020 at 13:18
  • 1
    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. Feb 26, 2020 at 20:20

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .