Have you ever wanted to make wild Pokémon have their Hidden Ability, but not by event, or adding it in the PBS alongside their normal abilities? To have a smaller chance of finding the ability?
Well, looks like I have the thing for you. It's a really simple code, but it's easy to modify the percentage to make it easier or harder to obtain.
Post the following code at the bottom of PField_EncounterModifiers:
# Make all wild Pokémon have a chance to have their hidden ability...