I have a awesome balanced team with a fire, water, grass, flying, ground, and electric!
typhlosion level 100
ampharos level 99
feraligatr level 98
dragonite level 97
rhydon level 96
meganium level ??? (somewhere in the 50s)
I did not cheat, and I did not use rare candies. I don't know why I did this, but I put them in an order and stuff. So I'll make meganium level 95.