I decided to make a list of the unreleased hidden abilities. The list is in alphabetical order by abilities and will be updated once a pokemon is released with its hidden ability.
This is mainly a reference list for those of you who want to make a team. Because if you try to battle with a pokemon who's ability hasn't been released Nintendo will not let you battle over wi-fi.
Let me know of any errors. And yes, this was the best place that i could think of to post this.
QUOTE(Bulbapedia)
Generation V introduced Hidden Abilities, providing almost all Pokémon with another Ability. These Abilities are not found on Pokémon found randomly in the wild; only Pokémon obtained under special circumstances have these Abilities. All Pokémon obtained from the Pokémon Global Link, either via the Pokémon Dream World or a promotion, will always have their Hidden Ability, if they have one. Certain event Pokémon may also have their Hidden Ability. In addition, two incidences of Pokémon found in-game, the four Darmanitan in the Resort Desert and the Musharna found every Friday in the Dreamyard, also have their Hidden Ability.
If a female Pokémon has a Hidden Ability and is bred, it has a 60% chance to give that Ability to each of its children. Hidden Abilities cannot be passed down from male or genderless Pokémon, or when breeding with Ditto.
http://bulbapedia.bulbagarden.net/wiki/Hidden_Ability#Hidden_Abilities
For pokesav pokemon is mainly the same thing, once a pokemon is released with a certain ability your hack pokemon can be entered on wi-fi. However, it cannot be from any past generation nor it cannot have moves that can only be obtain in past generations when having a hidden ability.