What do you think is the best Eevee evolution?

Any really depends on what types you like

From Pokemon XD? Probably Jolteon or Espeon.

I evolved my Eevee into an Umbreon, so I say that Umbreon is the best evolved form of Eevee.

It depends. If you want defensive Pokemon I would leave it to evee or vaporeon or umbreon. If you want speedy Pokemon jolteon or espeon. If you want strong Pokemon flareon. There is new evee evolutions for evee in sinnoh: Glaceon and Leafeon.

Flareon

Are you an enthusiast with Water types? Go with Vaporeon,Or fire types? Flareon. See I chose Umbreon,Because I'm Dark type collector. So Choose any of these elements: Fire,Water,Electrcity,Dark, and Psychic.

Hey-o! Okay, so whenever I play Pokemon XD, I always think of what shadow Pokemon I want to catch before I choose and eevee element. If you don't want a jolteon, you can always get ampharos. If you don't want flareon, you can always get houndoom. If you don't want Espeon, you can always get Gardevoir. If you don't want Vaporeon, you can always get a sealeo. If you don't want umbreon, you can get a houndoom or duskull. Just remember there are always many substitutes for the eevee evolutions. So basically, whichever one sounds the worst from the Pokemon listed above, say sealeo, I would get a vaporeon. If the worst to you is Gardevoir, get an espeon. Hope that helped!

BLIND PEOPLE KNOW HOW BROCK FEELS, Pokemon LOVERS KNOW HOW I FEEL WHEN PEOPLE SAY THAT!!!