The DB_Tourney is my suggestion!!!
Now before you start scratching your head in confusion, let me explain.
You are allowed to make a team made up of the famous DB Pokemon. You know. Stuff like Mismagious for Hex, Lucario/Torterra for SF, Typhlosion for DT, etc. I am working on a list of approved Pokemon so the metagame will be fair...
I don't know much about rules and stuff, so you guys could take care of that if possible.
Just something I thought up ;D
List in Progress: Typhlosion (DT), Charizard (Trachy), Lucario (SF), Torterra(SF), Mismagious(Hex), Swampert (Swampert), Mew (Mew :3), Amoonguss (Mew) Politoed (Josh), Wobuffet (Wobuffet33), Gallade (Fritjof), Porygon2(Pika), Genescet(JirachiCelebiMew), Metagross(Holy Name), Starmie(Holy Name), Cobalion(Pokewatt), Volcarona(Pokewatt), Victini(Dr.Flame), Darkrai (Fate Itself), Zoroark(Ninja), Rapidash (Rapidash43586), Phanphy(Rio), Kingdra(Kingdra), Tyranitar (Victini Victory), Gastrodon (Devil's Advocate), Reniculus (The Pika), Meganium (trachy's brother/Trent), Froslass (Mega Griveous), Hippowdown(Gigaslash), Landrous(Feel Good), Absol(Absol), Slowbro(B3N), Gyarados (ErickHill) Dragonite(ErickHill)
In terms of metagame: Probably no Ubers, so sorry Fate.
EDIT: OK, I've worked something out. Because of all the mixed tiers, we'll have two groups you can battle in: RU and OU. We'll probably take out some of the overpowered Pokemon, probably Darkrai. This will even out the tiers a bit.