go into the burnt Pokemon mansion (not the research center, obviously) on the island,and make your way up through the building. The secret key will be in an item ball on a table, then return to the gym, and the door will open! Note: in Pokemon yellow, Moltres is found when heading to the elite four, not in the Pokemon mansion as some think.
It unlock the door to the gym in Viridian City. .
On cinnabar Island, to the left of the pokemon center, lies a "laboratory". If you go inside, then go to the right and enter the third door. Talk to the Professor there.
You could find it in the dotted hole. Remember to bring a Pokemon that knows cut to open the door.
You need to Get a mystery gift
4 island in icefall cave to reach lorelei you need to find HM7 inside icefall cave.
The key is in the Pokemon mansion.
It unlock the door to the gym in Viridian City. .
Use Cut on the door.
Use the Move CUT infront of the door 8D
to open the door of the 7th gym!
Open the door and challenge the gym leader.
You just have to go up to the door and have a Pokemon to use Cut on it. Simple. Hope that helps xx
i assume you mean leafgreen. use cut on the door.
In the toliet
In the basement of the Pokemon mansion on cinnaber.
On cinnabar Island, to the left of the pokemon center, lies a "laboratory". If you go inside, then go to the right and enter the third door. Talk to the Professor there.
To get in, use a pokemon with the hidden move CUT to get inside.hope I've helped.