Now there have been some different speculation on how to get the three different Eevee evolutions, like what team you’re on, or the special move that your Eevee has, but alas these are all wrong.The secret lies within the old Pokemon cartoon from the late 90’s. Ash meets up with three Eevee trainers who all have their own evolved Eevee. The brothers are named Sparky, Pyro, and Rainer. Sparky had a Jolteon, Pyro a Fareon, and Rainer a Vaporeon.
Now, to get the evolution that you want all you have to do is rename your Eevee to the name of one of those three trainers. Sparky for a Jolteon, Pyro for a Fareon, and Rainer for a Vaporeon. It’s that simple.