When I breed a female Gible (with sand veil as its ability) and a male Druddigon (with rough skin as its ability) will I be able to get a Gible with its hidden ability rough skin
According to this article about breeding, the male's ability cannot be passed down by breeding. If the male could pass down abilities, it could lead to a monstrosity of different pokémon with unknown abilities.
The article also says that there is a 50/50 chance to get either ability if the pokémon has two possible abilities. If the female has a rare ability from Pokémon Dream World, there is an 80% chance the ability will be passed down.