If so what are they?
Well, I'm going to answer, as people do seem confused :)
There is an ability that no Pokemon have. It is Cacophony, an ability that protects the Pokemon against sound related moves. It was coded in Gen 3, but it was never used.
This is what you need, I guess. No Pokemon gets the following Abilities as their hidden Ability.
The only Ability that no Pokemon had is Cacophony, which was programmed into the Gen III games but had no Pokemon that have it. It was removed from the game in Gen IV.
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