You read the middle braille, head for the middle of the room, and use fly. the door should open, and you'll be able to fight a level 40 Registeel.
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i would say yes its defence is realy good if u have sapphire emerald or ruby u can get registeel in lilycove but the cave door must be sommoned to open
Go to lilycove city and surf right then up into a cave by the sea. Then go through the door that is above the room.
It is a little north west of Lilly cove you will see a cave on water with a door everywhere
you swim out to the spot where sootpolis is and you dive under water and go around that area until you see a spot with like a cave door and you go in. then you dive up and surf the water until you reach land.
cut the door