Best Non Legendary Pokemon to Complete My Team?

Garchomp should be the one with Earthquake, due to its being a Ground-Type. And maybe replace Outrage with Dragon Claw. You'll have more control that way and won't get confused. Anyway, for your sixth, Blissey. That's the one I always recommend. Why? Because Blissey is a tank. At its maximum, its HP is over 700. Its Special Defence is also ridiculous. A great sustainer for any team. Hope I helped! =D