If you have the DLC, you could take a huge detour and just do dynamax adventures in the crowned tundra until you have enough dynite ore for an ability patch. it'd take a long time and is completely unnecessary since the game is easy AF
Instead, I'd just give it a dark move. Throat chop is the strongest one you have easily available at 80BP, but it's a TR so you'll have to do dark-type raids or wait for a TR vendor to give you one.
Night slash is inconvenient to get since its an egg move, but with the leek item equipped you'll have a 100% crit chance when using it. To get it, I'd recommend breeding a Diglett (since it learns night slash at level 1 via move reminder) with your Galarian Farfetch'd.