For many Pokémon GO players, evolving Eevee into one of its three forms might seem random. And, to a certain extent, it is. However, players have figured out an Easter Egg (or glitch) that allows you to force evolve your Eevee into the Eeveelution of your choice (Jolteon, Flareon, or Vaporeon).
According to Redditor smithnigel (and confirmed by tons of others, plus video proof), you can specifically choose what evolution of Eevee you get. And it’s pretty simply.
As explained, the Eevee Brothers from the original anime were named Rainer, Pyro, and Spary; they owned Vaporeon, Flareon and Jolteon respectively. So all you have to do is nickname your Eevee after one of the three brothers and it will evolve into the respective version.
Eevee Evolution Nicknames
Sparky = Jolteon
Rainer = Vaporeon
Pyro = Flareon
Here’s some video proof of this Easter Egg/trick/glitch working.
Again, it’s unclear if this is an intended Easter Egg or if it is a glitch, so do it while you can in case Niantic decides to nix it.