You dont open doors. Theyll be open or when you walk into one youll go through. Some doors may be locked and youll have to find the way to open them.
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Read the braille, then don't touch the game for about 2 minutes. This will open the door to Regice.
I don't think you can, in emerald you need the nationaldex and POW! it's open but in ruby and sapphire you can't.
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.
cut the door