Hidden Abilities are a special ability that a Pokémon can have. Only some specials can have a hidden ability, and they can only have one if obtained in a certain way. A hidden ability will not be lost during evolution. Sometimes, Special Event Pokémon may also have a hidden ability. Generally, there are two ways to get a Pokémon with a hidden ability.
It is possible to breed Pokémon with hidden abilities as long as one of the parent Pokémon has one. Female Pokémon are slightly more likely to transmit a hidden ability than male Pokémon.
Skill Patches will allow players to unlock hidden abilities within their Pokémon in Brilliant Diamond and Brilliant Pearl. Many Pokémon may have a hidden ability in addition to their normal abilities, and some of them can be quite powerful.
To get the skill patches, players will need to reach the post-match. This means beating the Elite Four, then going to the Battle Park. In the Battle Tower shop, players will be able to purchase skill patches for 200 battle points.
Due to the high price of the Ability Patches in Brilliant Diamond and Shining Pearl, it is a good idea to think long before using them. It is also not possible to undo the change once it is complete, so it is a good idea to turn off autosave BEFORE making any changes in case you experience buyer remorse. It is also important to note that hidden skills have the potential to be passed on through breeding.