What Pokemon have no weaknesses?

Question

I already know Spiritomb, Sableye, Eelektross, and a few others with Air Balloon have none, but just looking to see if there are more.

Answer 1

No more.
Any pure electric type with Air Balloon as well as Spiritomb, Sableye and Eelektross are the only Pokemon with no weaknesses. This may change when the new type resistances and stuff come out with X and Y, but as of now there are no others.

Comments

It looks like Sableye and Spiritomb will be weak to the fairy type in Gen VI, though, depending on whether the type chart we have remains the same.

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Sableye and Spiritomb now have weaknesses since gen 6! Now only Elektross has 0 weaknesses without the help of an item!