Jolteon! Electric Pokemon are the best. I has a Flaaffy right now in PKMN Black 2 and I love it. Jolteon was my 2nd favorite of the original three, and I always had a hard time choosing between the thunder stone and the water stone in R/B/Y.
I just got Black 2 and I've been working on painting all of the Eeveelutions. I've finished all of them, and I'll post one daily. In the end, I'm putting them all together into one big picture. Hope you like it and thanks for looking! <3