A cool aspect of Generation 7 is that they gave every single evolutionary family of new Pokémon an exclusive ability and/or signature move invented just for them.
(Exception being the UBs, but they all share Beast Boostmanyway. Lycanroc Midnight and Vikavolt also don't personally have access to Accelerock and Battery, but their family lines do.)

This holds true for most Alola forms as well, the outliers being Raticate, Ninetales and Persian. So I speculate they originally intended for every Alola form to follow suit. (Doesn't explain why they didn't give Aurorus Aurora Veil, but whatever.)

Anyway, they're absolutely gonna more widely distribute these things in Generation 8. What Pokémon could you see getting these? Comatose Musharna? Tangling Hair Tangrowth? EVERY Rock Type, and Accelerock?