You Can Choose Your Eevee Evolution
Before this Easter egg was discovered, many Pokemon GO players were under the impression that your Eevee evolution was completely random. This meant that evolving your Eevee with candy would give you one of the three evolutions randomly: Flareon, Vaporeon, and Jolteon. Unfortunately for those who wanted to complete their Pokedex, this was a bit of a headache because of the amount of luck and hard work involved in the process.
However, there’s actually a cool Easter egg that allows players to control the evolution. By naming your Eevee Sparky, Rainer, or Pyro, it will evolve into Jolteon, Vaporeon, and Flareon respectively. This is a pretty cool nod to the original anime episode with the three Eevee brothers, and it’s a nice trick for players to get the evolution they want.