How to legalize a hidden ability

[Esksk]

How do I legalize a pokemons hidden ability using pkhex?

 

[Kaphotics]

You'll need to be much more descriptive because hidden ability has been around for 5 generations now. 

Be sure the hidden ability is possible to obtain in the game, and ensure that the encounter is capable of obtaining it in the situation where the game does not have Ability Patch available.