What is a good pokemon team?

i have like a gazillion pokemon on diamond, pearl, heartgold, platinum, sapphire, ruby, emerald, and firered. and now im trying to combine my pokemon into teams. with all the gmes together i have all 493 pokmeon, i just need to know what six pokemon would make a killer team. please give your ideas, make sure you label there nature level EVs etc but DONT suggest ledgendaries! i have them all, and theyre awesome, but i feel like im cheating when i use them, i only have them to have tgem not to battle. please give your suggestions for a great team. thank you!!!