This fully adds Cliff Cave itself. The rest of the route isn't there, but you can access the cave via the Debug Room, featuring a crudely made cave structure.
I've also modified the Rock Smash wild data to feature some additional Pokemon. The Beach has a 20% Corsola, and Dark Cave has a 20% Phanpy, among other bits. Level scaling has also been applied.
The Cliff Cave music isn't right, I believe...but I don't know what it's actually meant to use, I haven't played HGSS since it was current gen.
