Scorched Slab is a tiny cave in the middle of an indented lake in Route 120. There is a small opening in the rock which lets the lake's water in the cave. About two-thirds of the cave is filled with water; the other third is a dry slab of rock, giving the cave its name. The entrance is accessed by surfing across the lake and through the small opening. Surfing northward to a lone, small piece of land, the main attraction—TM11 (Sunny Day)—can be obtained here.
In Omega Ruby and Alpha Sapphire, Scorched Slab gains three basement floors, and becomes a full-fledged optional area for the player to explore, with items to find and wild Pokémon to battle. The lower floors are dark (but not the lowest floor), but can be illuminated with Flash. There is a boulder that can be moved with Strength, although moving it only creates a minor shortcut.
After defeating or catching GroudonOR/KyogreAS, Flannery can be found on B1F. After she tells the player about a rare Pokémon inhabiting the cave, Heatran can be encountered through a portal at B3F.