It really depends on the area, but more than likely, it'd look something like this:
2 Leafeon Lv. X
2 Leafeon (The Holo)
1-2 Espeon (Depends on area, plus boosting HP is helpful)
1 Umbreon
1 Glaceon (The Holo)
1 Glaceon Lv. X
And then possibly even Vaporeon for stuff that spreads damage. Use Vap. to heal it off with it's first attack. Flare is nice against stuff like Beedrill, and Jolt is great against Empo. It really depends on the area, but this is sort of a standard sort of line-up.