OK, so I know this section isn't as active as it used to be, what with people being busy, but I thought of this set the other day and I reckon it could work pretty well.
Eevee @ Liechi Berry
Nature: Brave
Ability: Adaptability
EV's: 252 Atk/252 Sp Atk/6 Def
~ Endure
~ Flail
~ Shadow Ball
~ Dig/Sleep Talk
So yeah, this Eevee pretty much needs to be on a Trick Room team for it to be fully effective. It's mixed, since its movepool is very shallow, but this means it can hit Ghosts with Shadow Ball.
The strategy here is to Endure, getting down to 1HP, activating your Liechi Berry and getting Flail to full power (200 BP WITHOUT the Liechi boost or ability). This is increased further thanks to Adaptability, meaning this Flail is gonna hurt, even though it's coming from an Eevee. As for the rest of the set, Shadow Ball hits Ghosties and Ghouls, whilst the last slot's a toss up between Dig and Sleep Talk, mainly 'cos of having so few options to begin with. Dig hits Steels who you couldn't really harm otherwise, whilst Sleep Talk lets you work the magic of Flail as you snooze.
As this set is based around Flail and designed for Trick Room, I went Brave (+ Attack - Speed). The EV's are pretty straight-forward. Max Attack and Special Attack let you hit as hard as possible from both spectrums, and the last EV's went into Defence 'cos it might help against Earthquakes and stuff =D