Alright, my detailed listing:
1. Leafeon
I love all the Eevee members and more than the other PKMN Themes I go by, I tend to use the Eeevee Evolution theme more. I'd use each one if possible but because we HAVE to use Fly at some point or another (whether it's required or just practical), you can't use 6 of the 8 forms. PKMN Battle Revolution however you can use 6 of the 8. Leafeon is one of my favorites, but probably taking place in
Number 3 because he looks cool, he reminds me of myself for some reason, he also has awesome stats with some great moves PLUS he has an ability that opens up a few combos.
2. Espeon
All of those who know me best inside and out say that I'm this one through and through. Other than looks, I would say this pokemon is awesome to the extreme, great ability built in: Synchronize, screw your Powders! The Psychic type just suits me best, the type is among my favorites as well, Espeon's looks are cat-like and I have a couple of cats, so a little more plus to it, I'm not a HUGE fan of the sleek body design but I can easily manage. I don't like the poses they put Espeon in for their battles whether it's 3D (Stadium/Colosseum series) or 2D sprites. But you also HAVE to bond with your Eevee in order to get Espeon, so right off the bat along with Umbreon it becomes hard to swap them out. But, other than Umbreon, Espeon was my first Johto Eevee evolution, so because of all of these above reasons: Espeon is now a
Number 1 of my favorites.
3. Umbreon
Number 4 of my favorites, I love the design, BUT the move set they give Umbreon suck! You get maybe 2 or 3 good ones built in but they're not strong, you must teach TMs to compensate, but other than the moveset, Umbreon gets my passion. As everyone else states, the glowing rings, the overall design is terrific end of story. The ability he has is also amazing, Synchronize.
4. Vaporeon
Vaporeon started out as my number 1 favorite back in R/B/Y and probably had a massive (and losing) struggle to stay on top of my favorite list of the evolutions. The design is cool, he can surf, waterfall, whirlpool, and even dive to help you with your needs on your journey, even better is that he learns Aurora Beam to help handle some flying and dragon types. Teaching him Ice Beam became one of the musts to teach to him, replacing Aurora Beam so he can learn the rest of his standard moves, this guy was one of the more versatile evolutions and in the anime he doesn't disappoint with the looks. I just hate the fact that they always have him in that sitting position, I would like to see him in more than just that dang sitting position in the Stadium/Colosseum series and most of his usual sprites. He is now my
Number 5 of the list.
5. Jolteon
Now, Jolteon is an interesting character, he not only learns some great electric moves, but they gave him a few other types as well, a bug and a fighting move to pour in there to handle with other types, to take care of the grass and psychics with the Pin Needle attack, then he has Double Kick to handle some of the rock types, HOWEVER his ATK is nowhere as good as his SP ATK, which is shouldn't be better anyways, he's an ELECTRIC type, moves like Spark and Volt Tackle aren't exactly in his roster so you shouldn't rely on his Double kick or Pin Needle. So all in all, his design is cool but he's just not for me, I'll keep Raichu and Luxray, soon that flying squirrel as well... thanks, so Jolteon is
Number 6 of my favorites.
6. Flareon
Flareon, a cute and cuddly evolution, someone you just gotta have, in my opinion he is my
Number 2 of the list, the lack of fire types is a big hassle and having a Flareon right there in Platinum was a HUGE help for me to take down Cynthia who was a pain and almost impossible, thanks to Flareon's and Raichu's efforts in Platinum, I managed to beat her. The stats aren't great and they don't provide Flareon that many great techniques from the get go, but over time he can help you out ESPECIALLY in the 4th generation when you don't get many fire types to use. I've always liked Flareon from the beginning but he just can't match up to my first favorite (who is water) and definitely can't match up with Espeon.
7. Glaceon
The most female looking of the group, not exactly a breath of fresh air either. The problem here is that they made an ice type, which we have plenty to catch in Gen IV especially the lengths in which you must go in order to get it, sure just fly and head west to evolve it, but whatever. This pokemon isn't for me, just like Jolteon and its sadly in
Number 7 - last place (8 if you count Eevee, yes even Eevee tops it in my opinion) of my personal favorites, a plus to this pokemon though is that I love the battle cry it makes in the game.