The brave pioneers on the Pokémon Quest subreddit have finally confirmed exactly how players can choose what evolution they get for Eevee in the new Nintendo Switch game.

A post outlining the procedure emerged on the game’s subreddit in the early hours of Wednesday morning. Through the scientific process of trial and error, they seemingly figured it out. Here’s what you need to know.

Like all Pokémon in Quest, Eevee evolves when it reaches a certain level. In Eevee’s case, that’s level 36. Previous, incorrect theories assumed the specific evolution was determined by what slot you put Eevee in. What Eevee actually evolves into depends entirely on what Power Stones it has equipped when it levels up.

In most cases a Pokémon in Quest has Power Stone slots that take either attack- or health-boosting stones. However, Eevee is one of the somewhat rare Pokémon with slots that let you to pick which type of stone you place there.

Here’s how it all breaks down:

  • Jolteon — No Power Stones or an equal number of Attack vs. Health
  • Flareon — More Attack Power Stones equipped than Health
  • Vaporeon — More Health Power Stones equipped than Attack
Eevee as it appears in the Pokémon anime.
Eevee as it appears in the Pokémon anime.

If you know anything about the statistics for these Pokémon in the main games, then this method kind of makes sense in the oversimplified world of Pokémon Quest. Most of Flareon’s stats in the main games are in Attack, whereas Vaporeon has loads of HP. Meanwhile, Jolteon has very low HP, Attack, and Defense. But things get more complicated when you factor in Special Attack, Special Defense, and Speed, which don’t really play into Quest at all.

It’s also worth noting that as of right now, Pokémon Quest focuses exclusively on Pokémon from the Kanto region, which means you can only get the Pokémon from the original games, Pokémon Red and Blue.

That means Vaporeon, Flareon, and Jolteon will be your only options for Eevee for the moment, but its entirely possible that, like Pokémon GO, Quest could see future updates that add more and more Pokémon into the mix, including other Eevee evolutions.

Photos via The Pokémon Company International, The Pokémon Company