Alright, so I've got a Female Sharpedo with a Perfect IV in Attack, and a Male Sharpedo with a Decent Speed IV and Speed Boost (but awful Attack. :/). Is it possible for the Hidden Ability to be passed down at all? All I've got so far are Rough Skin Carvanhas.
If Speed Boost is the Hidden Ability for Sharpedo.. then No, it won't pass, because the female needs to Have the HA
If you want the Hidden Ability Carvanha breed the male with a ditto, males can pass down Hidden Abilities with Ditto
Hope I helped :D