How hidden ability is different from normal ability?

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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 five 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 Abilitiescannot be passed down from male or genderless Pokémon, or whenbreeding with Ditto.

Hidden Abilities On Bulbapedia

Hidden ability is the ability that some pokemons get only fromDream World.For exampleBulbasarhas the hidden ability Chlorophyll which boosts the Pokémon’s Speed in sunshine.Bulbasar can’t get this ability.Also there are some moves that pokemon get only from Dream World like Sukern.If you catch it in the DW it will have the move Earth Power.

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