User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-5043481-20130404185353/@comment-112.209.20.97-20130404224305

Unlucky cat skill is almost always coupled with some sort of luck skill. So it's some sort of a tradeoff. You can get them from drinking master's drink in the canteen. Unlucky cat also sometimes let you start with, I think, 1 hp. Other unlucky effects, I have not encountered yet.