I'll try to help.

Vaporeon @ Leftovers
Ice Beam
Surf
Haze
Toxic/(Chesto)Rest/Wish

Jolteon @ Leftovers
Thunderbolt
Thunder Wave
Attract/Bite
Wish/(Chesto)Rest

Maybe. para-attract them. Wish for the hell of it. Bug and normal moves would mean you'd split EVs. Up to you on that.

Flareon @ Leftovers
Flamethrower
Shadow Ball
Return/Toxic (Protect if you use wish)
Wish/(Chesto)Rest

Shadow Ball and Flamethrower calls for EV splitting... oddly, Flareon's max attack is higher than his max special attack which is why i suggested putting return and since flamethrower gets STAB, it kind of evens out ??

Umbreon @ Leftovers
Moonlight
Mean Look
Faint Attack/Psychic (for Fighting Types)
Toxic/Confuse Ray (probably toxic)

Espeon @ Leftovers
Psychic
Bite
Reflect/Calm Mind
Morning Sun

Reflect would help the rest of the Eevee family since they all tend to have low defense but high special defense.

Sandslash @ Leftovers

I might drop aerial ace for rest (with chesto berry) for staying power. If it comes down to it, I'd stick with Aerial ace instead of swift. but if you don't like rest, I'd go with brick break over aerial ace and swift.

I just realized how much the Eevee family sucks IMO. Their move pools are terrible. =\