Add someone that can change the current ability to the Pokémon's hidden ability and vice versa.

[Hurdedur]

I want to know how to add someone into the game that will be able to change a Pokémon's ability to its hidden ability and back (this will also likely come with a cost either with money or with an item).

 

[WiserVisor]

I want to know how to add someone into the game that will be able to change a Pokémon's ability to its hidden ability and back (this will also likely come with a cost either with money or with an item).

This post will probably help you out.