From Bulbapedia, the community-driven Pokémon encyclopedia.
This is a list of all Pokémon with Hidden Abilities that can not be legitimately obtained with these. Note that some that have been released with their Hidden Abilities are still very hard to obtain, with one evolutionary family from an event, and with several other lines having been released only through promotions: the Eevee line, Blissey, the Kanto, Hoenn and Sinnoh starters, Togekiss, Porygon, Mamoswine, Lucario. With the exceptions of Singing Pikachu, Pokémon Café Eevee and Blissey (and Porygon, being genderless), such promotions have not yielded female versions either, making it impossible to further pass the Hidden Abilities on by breeding. This list may serve as a reference list of Pokémon likely to have their Hidden Abilities released upon future Global Link updates for the upcoming Pokémon Black and White 2.
List of Pokémon