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Not hidden or kino but I wonder if they planned on adding a mini dungeon here and just forgot about it.
At route 120 there's a cave in the small lake under the bridge. The area inside it is named, just like Rusturf Tunnel or Granite Cave, and it's called Scorched Slab. However, inside it there's just small platform with the Sunny Day TM on it. No wild Pokémon, nothing. If you hatch an egg there, it'll say the Pokémon was born on Scorched Slab, though...
