It's so hard to pick just one favorite, because they're all
adorable in their own way! But, since I gotta choose... It's
a major tie between Espeon, Umbreon, and Vaporeon.
I choose my favorite Pokemon (In this case the Eeveelutions)
when I use them and see if they're useful. Espeon, Umbreon, and
Vaporeon are the only 3 Eeveelutions I've used EVER. I also used Leafeon
for a bout 2 seconds before I suddenly didn't want it anymore. xD I'll have to
use each and every one of the Eeveelutions before I can truly pick my favorites.