Top 10 Eeveelutions

I have 9 Eeveelutions, one for each moveset. I've kept the highest IV for each and transferred the rest. I don't believe in hoarding, although I am sitting on 8 90%+ IV Eevee's for future generations.

1. Vaporeon: 3089 (Aqua Tail)
2. Vaporeon: 3073 (Hydro Pump)
3. Flareon: 2842 (Flamethrower)
4. Flareon: 2826 (Fire Blast)
5. Jolteon: 2671 (Thunderbolt)
6. Jolteon: 2671 (Thunder)
7. Flareon: 1985 (Heat Wave)
8. Jolteon: 1326 (Discharge)
9. Vaporeon: 1169 (Water Pulse)

I only have 6 eevee evolutions that I kept.
Vape cp 2700 wg + at
Vape cp 2204 wg + hp
jolt cp 2296 ts + t
jolt cp 1989 ts + t
flare cp 2304 e + fb
flare cp 2272 e + fb

I only ever use the 2700 vape and the 2296 jolt. If I need to kill a big stack of things those would kill, I find some other suitable species. (Attacking with multiple of the same type seems kind of boring.) I kept my second bests for sentiment.

My highest two Eveveelutions were both wild caught 'above average' high cp Evees that I evolved but haven't powered up:

Vaperon wg/wp 2495
Flareon e/ft 2459

The highest two I've powered up from lv20 hatches are:

Jolteon TS/T 2418
Jolteon TS/TB 2375

Then it's a Vaperon I've had since early in the game that I powered up from an egg hatch (not sure on original level) 2271 wg/at

There are various ones below that unpowered up.

We have a lot of Eevees around where I live, so there isn't a shortage of Vapes, Jolts, Flareons, so I'm lucky to have an army of Eevolutions... but if I only could keep one of my 'mons, it would be my 2843 Vaporeon (WG/HP) which I caught in the wild when I was very new to the game as back in July (32 levels ago). My son told me about the Rainer trick and said I should definitely evolve this one because it was almost perfect. Glad I did. I can plow through 5 or 6 defenders, (or more if they're weak) with this single Vaporeon and still have 1/3 HP to spare. Whenever its almost time to power up, I leave it in a gym long enough to earn its dust, then feed it when it comes out. It's one of the few 'mons that I'll continue to power up all the way to the max for as long as I play the game.

1. 2744 Vape WP - my first one, below level 10, probably did 80% of my fights until level 23-24 or so. After that started to get well deserved rest on long term gyms.
2. 2626 Vape AT - cough wild, a bit above 1700, 85 IV, ??? for CP at that time, so was my max CP :). Took the heavy fight from the above one, until
3. 2584 Vape HO - average IV, only one with hydro pump. When in trouble ..:)
4. 2440 Flareon - fireblast
5. 2397 Jolteon (my highes IV eevee, 96), Thunder
6. 2330 Vape WP
7. 2269 Vape AT
8. 2252 Vape AT
9. 2132 Jolteon Thunder
10. 2123 Flareon Fire blast
    2 more JOlteons above 2k, one mor Flareon above 2k
    1 Jolteon with IV 91 and Thundershock waiting for power up sometimes.

Two 730 eevee waiting for random evolution (but I'm in no rush, I'm in a period in which I use any other pokemon then Vaporeon :) ).
Also 3 with 82+ IVs waiting for umbreon and espeon.