In the games I never train more than four at a time, 'cause there just isn't enough EXP to go around. However, I'd ideally want to go with one of these sets:
Blaziken, Manectric, Milotic, Flygon, Absol and Metagross
OR
Charizard, Gyarados, Jolteon, Steelix, Exeggutor and Umbreon
OR
Venusaur...