Lady Lilith: First, separating your Pokemon by tiers...
OU: Azelf, Blissey, Celebi, Cresselia, Jirachi, Milotic, Togekiss, Yanmega
BL: Articuno, Espeon, Floatzel, Gardevoir, Mesprit, Minun, Mismagius, Roserade, Shaymin, Umbreon
UU: Altaria, Ariados, Banette, Beautifly, Bellossom, Butterfree, Castform, Cherrim, Clefable, Corsola, Delcatty, Froslass, Glaceon, Gorebyss, Illumise, Jumpluff, Leafeon, Ledian, Lopunny, Lumineon, Lunatone, Mawile, Meganium, Minun, Ninetales, Pachirisu, Phione, Sableye, Shiftry, Shuckle, Venomoth, Vileplume, Wigglytuff, Wormadam
Second, is this supposed to be 2v2, or 1v1?