How to pass on abilities

The most notable change is that Hidden Abilities, which previous required you to have the mother with the Hidden Ability, can now be bred without the mother having it. If the father has got the Hidden Ability, there is a small chance that the offspring will also have their Hidden Ability. However, this only works if you are breeding with a Ditto. This is even more useful considering Hidden Abilities are more easily found via Hordes and Friend Safari.


Source: www.serebii.net/xy/breeding.shtml