One of my friends got me an (hacked) Serperior with his hidden ability Contrery. Becouse it doesn't have the right nature and EV training I wanted to make new one but it doesn't work. I've got a male Zoroark with a modest nature and my female contrery Serperior, but all I get out of the eggs are snivy with overgrow. I also tried to use a modest male Snivy breeding with my contrery Serperior but that also didn't work. Am I doing something wrong or is it becouse my Serperior is hacked ?
>From Generation V, female Pokémon with Hidden Abilities have a 60% chance of passing on the Hidden Ability to their offspring when bred with a male Pokémon from the same Egg Group.
Since it's only a 60% chance of passing down a hidden ability, just keep trying. ;) Other reasons it won't pass down may be because it was breeding with a Ditto.
If you've fixed up all the problems and it still doesn't bring down it's ability, it may be because it was hacked. However, it shouldn't happen because it's perfectly normal for a Pokemon to have it's hidden ability. ;D
Hope I helped. :) Source: http://bulbapedia.bulbagarden.net/wiki/Pokémon_breeding#Inheriting_Abilities
If the Serprior is a male it wont pass it down, and if it is hacked then I am not sure if it will pass down Contrary