The best Eevee evolution depends on the context in which it will be used. Here are some of the most common opinions from different sources:

• Umbreon: According to, Umbreon is the best Eevee evolution in Pokemon Go, especially for PvP battles. It has great defense stats and powerful moves that make it one of the best Dark-types in the game. also mentions Umbreon as a great wall.

• Espeon: suggests that Espeon is a quick and good hitter, and its ability is nice. mentions that Espeon is one of the strongest Eevee evolutions overall from stats alone, with the highest possible attack overall.

• Vaporeon: ranks Vaporeon as the third-best Eevee evolution in Pokemon Go, and suggests that Vaporeon is good for PvE battles. It is also one of the classics and relatively easy to obtain.

• Sylveon: ranks Sylveon as the third-best Eeveelution overall, and mentions that Sylveon has the highest possible CP, beaten only by Espeon, and the highest possible attack overall.

• Leafeon: ranks Leafeon as the fifth-best Eevee evolution in Pokemon Go, and mentions that it is a Grass-type.

• Glaceon: ranks Glaceon as the sixth-best Eevee evolution in Pokemon Go, and mentions that it is an Ice-type.

• Flareon: ranks Flareon as the eighth-best Eevee evolution in Pokemon Go.

• Jolteon: ranks Jolteon as the seventh-best Eevee evolution in Pokemon Go.

Overall, Umbreon seems to be the most commonly recommended Eevee evolution for PvP battles, while Espeon and Sylveon are also strong contenders. For PvE battles, Vaporeon is a good choice. However, the best Eevee evolution ultimately depends on the players personal preferences and the specific context in which it will be used.