A recent leak reveals that every Pokemon type plays a major role among Pokemon Scarlet and Violet's specialists (namely gym leaders, Elite Four, and Team Star Bosses), except one: the Rock type. For some reason, it is the only type not associated with a specialist trainer, meaning it probably doesn't feature heavily in the games. Now, it could be that Pokemon Scarlet and Violet's champion focuses on Rock types, though that is unlikely, or it could be that the Treasure Hunt storyline just so happens to feature a bunch of Rock Types (as it revealed Klawf), but it remains to be seen.