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The wielder cannot be struck by critical hits.
This ability is situationally useful, but suffers as there is very little that it can really accomplish outside of being a useful little perk. Another problem with it is its relatively low distribution; only three Pokemon, Kabutops, Armaldo, and Drapion, receive this ability outside of the Dream World. Generally speaking, Kabutops will almost always prefer Swift Swim, though Armaldo and Drapion can perhaps find some use of it. Marowak receives it from the Dream World, and certainly it is more useful than Lightningrod, as well as Rock Head should you not be using Double-Edge.
Found in Dream World