>>32430945it really makes no sense why they made and kept Strength as a Normal-type move this whole time
You fix its problem entirely by making it rock-type. That's literally it. Change the description to "User rolls a boulder in the foe. Can also be used to roll boulders."
this is the easiest thing in the world to do. Sure it's stronger and more accurate than Rock Slide after this, but Rock Slide flinches and has a niche in doubles.
It's not like Rock is even broken. A grad total of one type resists Shadow Ball but it's far from broken