I want to do a Rock type run. What's the best game for it?
it doesn't exist senpai
>>27329459
All Pokémon games?.
Platinum. All of its Rock pokemon are available very early.
>Both fossil pokes easily available shortly after first gym
>Onix available before first gym
>Geodudes a-plenty in early routes
>Nosepass after second gym
>Bonsly after second gym
>Rhyhorn available before third gym
So your team would be Onix (you could evolve it but it loses its Rock type), Graveler (Golem if you trade/tweak evolutions with randomizer), Probopass, Sudowoodo, and Rhydon/Rhyperior, with a fossil pokemon of your choice (Bastiodon or Rampardos, you just have to dig it out once you get the Explorer Kit).
Your options are a bit limited, but I don't think any other game gives you so many rock types so early.