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Go into the cave of origin fight him and let him faint or catch him and when you come out go to the gym
In Ruby and Sapphire, you have to fight the respective legendary before the doors open.
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.
The eighth gym leader is in the underwater city(forget the name) but it is where you fight groudon. after you beat him the gym should be open.
go to map land 6 but you must beat all gym leaders including the elite four
Pokemon ruby where is the 6 gym
Norman's gym
You must finish the mission that would make the weather the same again. After that, everyone will be all happy and the eighth gym will be open to you.
its the petalburg gym and/or gym 5.
petalburg gym
I'm think in the woods at the start of the game.