What is a hidden ability?

Question

Can anyone please tell me what exactly is hidden ability? does it mean that Pokemon have a lower chance of having that ability? I cant find it on the internet for some reason.

Comments

It’s a rare ability you can only get through certain methods, which varies from game. They’re usually better abilities, but sometimes not.

They were introduced in gen 5 (black/white) and remain in all subsequent games.

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https://pokemondb.net/pokebase/278890/how-do-i-get-a-pokemon-with-its-hidden-ability
Does this help?

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thank you everyone, very much appreciated!!