Changing Egg abilities in HGSS with PKHaX

[MochaMint]

I am attempting to use PKHaX to change the ability of an egg to one that isn't legal for the Pokemon but whenever the egg hatches the Pokemon is given its default ability. Is there a way to fix this?

[Kaphotics]

No, if the game is sanity checking the Ability when hatching, then the only way to change that is to find that logic in the ROM and dummy it out via a cheat code / layeredfs patch. Can't do anything with save editing.