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Aside from more special Rock type moves there should be an accuracy boost to Rock type moves when used by a Rock type Pokemon. This alone would help EVERY Rock type Pokemon, probably not much in PvP but definitely in playthroughs because let's not pretend that Stone Edge missing multiple times in a row or only being limited to Ancient Power and Meteor Beam doesn't suck absolute dick all around, because it does suck. ALL Rock type Pokemon should be buffed where needed in some way, NO EXCEPTIONS, no matter the popularity and/or typing, if it's a legendary/mythical Pokemon, or if it's "unsalvageable™" and "unsuable™" according to Reddit (but this isn't Reddit).
That's what I'd do to start. Maybe a little buckbreaking for Water and Fairy afterwards. Sounds like something that can be done with a ROM hack or fan game (because we all know Game Freak is cucked).