You might need to open the door to the 8th gym in Pokémon Ruby, Sapphire and Emerald. To do this you first have to awaken Rayquaza.
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In Ruby and Sapphire, you have to fight the respective legendary before the doors open.
you must beat all other gym leaders
At the end of the game, 8th gym, Giovani, head of Team Rocket.
the 8th gym is ground type
You can find the key to unlock the door in Pokemon mansion