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All types have their faults, but to me Dragon has the least. It's weak to itself I believe aswell as Ice, no? Those types aren't very common, so .. er.. ya. Dragon. ^^;;;
I think I did a small calculation (probably got it all wrong and mixed up, but oh well) and found that Ground was super-effective against the most types. Could be wrong there, but it's still a really good type when used right.
I'd have to say either Ghost because it cannot be physically hurt, and also Psychic cannot effect it without it's posion type counterpart found in ; Gastly, Haunter and Gengar.