When their Forme is changed with the Reflected Mirror in the Dream World, they will now have their Hidden Ability. For Thundurus
, their Ability would be Defiant, and Landorus
' ability would be Sheer Force. If the Reflected Mirror is removed, then they will change back into their Kenshin Forme. If the Kami Trio are moved to the Pokémon Black and White Versions 2 games from the Pokémon Black and White Versions games and the Reflected Mirror is used, then they will not have their Hidden Ability upon changing Formes.