I was just thinking, what type combos create a pokemon with no natural weaknesses? Dark & Ghost obviously. I can't seem to think of any others.
Grass & Fire, and Dark & Psychic come to mind, but then I remembered that Dark and Psychic would be weak to Bug.
Fire & Water would be weak to Electric.
Can you think of anything?
Also, do you think it would be fair if their were and Uber pokemon with no natural weakness?