People are going to say “give it a move that doesn’t miss”. But that sucks. That’s rock types “thing”. After steel took its place as main defense type, rock is now some weird high-risk, high-reward offensive type. I think it should reflect that.
>Rock type variant of explosion
>Rock type attack that randomly damages other pokemon on the oponents team, maybe even your own team
>High Accuracy, hard hitting rock type move that boosts the opponent’s speed/stat
>Recovery that lowers defenses
>Priority move with recoil
This won’t fix rock by itself, but more moves is always welcome.