All Eevee Evolution

Espeon (Psychic)

Max CP: 3000

CP	3000
ATK	261
DEF	194
STA	130

Best Moveset: Confusion/Future Sight

Espeon has one of the best Attack stats in the game, fourth only to Gengar, Alakazam and Dragonite. It's also one of four Pokemon in the game that can learn Future Sight, which is the second strongest charge move in Pokemon Go

. Espeon's only downside is a low stamina stat, so it shouldn't be impossible to beat it if you encounter it in a local gym. 

Vaporeon (Water)

Max CP: 3157

CP	3157
ATK	205
DEF	177
STA	260

Best Moveset: Water Gun/Hydro Pump

Vaporeon forms the rank and file of most Pokemon gyms, thanks to its high stamina and defense stats. Vaporeon has an insanely high CP stat, higher than all but five Pokemon in the game.

Flareon (Fire)

Max CP: 2904

CP	2904
ATK	246
DEF	204
STA	130

Best Moveset: Fire Spin/Overheat

There are only five Pokemon (not included legendary pokemon) with higher Attack Stats than Flareon in all of Pokemon Go. With access to the best moveset, Flareon would probably be the most useful of all the Eeveelutions...if not for a woefully low Stamina stat. It's low HP means that it's not a very good gym defender, but don't be afraid to pull Flareon out when you want to quickly clear through the opening levels of a gym.  

Jolteon (Electric)

Max CP: 2730

CP	2730
ATK	232
DEF	201
STA	130

Best Moveset: Volt Switch/Thunder

Like just about Eeveelution, Jolteon is the strongest Electric-Type Pokemon in the game. Jolteon has superior Attack and Defense stats, although its Stamina is pretty underwhelming. Still, there's a reason Jolteon is a common fixture in gyms, and it should probably be your top choice if you want an Electric-Type on your team of gym attackers. 

Umpeon (Dark)

Max Cp: 2052

CP	2052
ATK	126
DEF	250
STA	190

Best Moveset : Feint Attack/Foul Play

Umpeon is a Dark Type Pokemon. It evolves from Eevee. it has very high defense among all eevee evolutions in gen 2 but lowest attack and cp. In addition, umpeon definitely can defeat espeon due to it's strong against figthing and psychic.

Leafeon (Grass)（Gen 4)

Max CP: 2849

Glaceon (Ice) (Gen 4)

 

Max CP: 2866

Sylveon​ (Fairy) (Gen 6)

Max CP: 3094

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參考來源