Off the top of your head (without thinking), do you think the game is beatable from start to finish by just using the five eeveelutions? (anyone of the games, that is)

Definately...

Vaporeon kills Roxanne
Espeon kills brawly
jolteon kills watson (volt-absorb)
Vaporeon kills lavaridge
Flareon with HP fighting kills Norman
Jolteon and Vaporeon with Ice beam kills winona
Vaporeon, Espeon, and umbreon kill tate and liza
Jolteon kills juan/wallace
HP Flareon kills sidney and phoebe
Jolteon kills glacia
Vaporeon kills drake's dragons
All together kill the champions (Juan and Steven)

I could see needing a heracross, though. Flareon needs a fighting move.

What is HP? Hidden Power? If so.. how do you get it to be a certain type?

HP is hidden power. The type and base damage is based on individual values, also known as IVs. These values are set when you hatch an egg, but can only be calculated when a pokemon is at level 100. A very complicated subject, so you should go here

They can't learn Fly, off the top of my head. They might not need it, but I'm checking the others. . . .
--Surf, Waterfall, Dive
--Flash
--(none)
--Cut, Flash
--Cut, Flash
So you have Cut, Surf, Flash, Waterfall, Dive
You don't have Fly, Strength, or Rock Smash.
I suggest, that since you have room for an extra Pokémon, you can add Heracross (If you don't need Fly) or Tropius (If you do want Fly). Tropius can learn all three HMs that the Eeveelutions can't, and Heracross can learn Strength and Rock Smash, and it has good Fighting moves.

Oh, wow. I don't think about things like that. HM moves are typically overlooked by me, as I usually asign drones and slaves.

Yeah, I'm using the last slot for an HM slave. I'm not using it in battle or anything. Just to free up space for my Eeveelutions =]

HM slaves are good pokemon deep down. if you ignore the types, its mostly powerful with surf or stregnth.

Not trying to be a Necro - I was on vacation the past nine days but before I left, I ended up training my Jolteon and guess what attack he learned...

Double Kick

So there's a potential fighting move since my Flareon didn't provide me a HP Fighting.

1.) Necromany is 3 weeks, not 1.5 weeks, so don't worry (unless you bring up a topic to just spam/post an unneeded comment)

2.) Yes, Jolteon does get double kick. the problem is that the attack is rather dismal, and that is why we usually don't put it on.

Off-topic - YAY, 1400th post!

Back on topic.

Oh... well what if I amp up Jolteon's attack? Would that increase its chances of it not being so dismal?

Congrats on 1400th

Could I not just use Protein?

& what if it's super effective against a vulnerable type, is it still 60 or more?

Ah. Well, it kicks Team Aqua's & butt.

All the games then

FrLg

Vaporeon beats Brock
Vaporeon and Jolteon kill Misty
Jolteon pwns Lt. Surge
Flareon kills Erika
Espeon destroys Koga
Umbreon screws Sabrina
Vaporeon washes out Blaine
Vaporeon overtakes Giovanni
Jolteon and Flareon can beat Lorelli
Vaporeon and Espeon beat Bruno
Umbreon and Espeon kill Agatha.
Vaporeon and Jolteon own Lance.
All of them help for the rival.

GSC

Jolteon over Falkner
Flareon beats Bugsy
Any can beat Whitney
Umbreon owns Morty
Espeon beats Chuck
Flareon takes out Jasmine
Flareon destroys Pryce
Vaporeon blasts Clair
Umbreon pwns Will
Espeon screws Koga
Espeon and Vaporeon destroy Bruno
Use them all against their strengths for Karen
Vaporeon beats Lance


See P_L's for RSE

Ignoring HM nessesities, I'd say yes. You could beat all of the games with the Eeveelutions.

As for Upping Jolty's attack for Double kick, I doubt it would help much. Jolteon's attack is really not that good, so... No.

EDIT: wow. I starteded typing this and in that span, 5 different posts. Odd

i like i dont relley like the rest but i get them 4 there data
I now this is off topic but shuldnt this be on the kanto topic cause u cant get the eevee or any of them in hoenn without cheating

Uh.. I traded my Eevee from LG to Emerald. Breeded for the right number of eggs. Hatched them. Evolved them. Traded them to Sapphire.

well that the only way without cheating dau

Yep. Cheating would be the only other way.

Off topic, I should start FR for my Scyther.

Anyways, so even if I max out Jolteon's ATK, it won't do much of a help?

Well actually, aside from hidden power and t-bolt + t-wave, jolteon passes.

Why do I say this?

Because, If not using as a passer, you could use it as a kicker, sure. It would be like a filler move, if you know what I mean.

Well, here's what I have so far (keep in mind, I advanced with a little help of Emerald through TMs/HMs)

lvl37
Double Kick
Rain Dance
Thunder
Thunderbolt

Call me crazy and tear the set apart if you want.

ALSO,
don't you find it a bit odd how Umbreon cannot learn Theif when it is a Dark move and Umbreon is dark and it just seems to fit? lol, I dunno...

Can't rate sets here. But:

1.) Redundancies - if you're going with Thunder, why T-bolt?
I'd go with either T-bolt + T-wave or Rain Dance + Thunder.