Get a Pokemon who knows cut and use it on the door. You can't just press "A" at the door though you have to open your Pokemon menu and do it from there.
You have to have an e-reader. the e-reader game is behind them.
At cinnabar island at the pokemon lab third door.
Cut it. HM01.
it says cut the door, so go to the door then use cut with a Pokemon that knows cut and the door will open.
You walk up to the door and use cut.
Because the key to open the door is hidden in the Pokemon Mansion.
It is on 6 island in the dotted hole. (use cut to get past the door)
Walk through the wall.
It says in braille to cut. So you have to cut the door to get in.
The Pokemon that can be found in the Pokemon Mansion in Pokemon FireRed are Rattata, Raticate, Grimer, Muk, Growlithe, Koffing, Weezing and Ditto and you will also be able to find the key that will unlock the door to the Cinnabar Gym.
Just In the second door upstairs the Pokemon center.Answerwhen you give the ruby and sapphire to Celio AnswerYou need to give the blue and red stones to Celio on island one in Pokemon FireRed and in Emerald you need to have beaten the champion and elite four.
at your next door neighbors house