you could use the walk anywhere code to go around or through them.
other than that i don't know
fly or walk to Vermillion city then go east through vermillion city keep walking and there should be a sleeping snorlax blocking your path and a cave entrance.
Use the walkthrough wall cheat.
Get out of your grandmothers basement.
In Azalea Town, right by the exit/entrance of the Ilex Forest.
North entrance: West of Cerulean City on route 9. Navigate your way through trainers heading west until you reach the grass patch and the water. From there, head south to the Poke Center. The entrance is to the east of the center. South entrance: To the North of Lavender town.Go to Vermilion City, where misty is the gym leader, go east, cut the small tree blocking your way. Follow this until you are at the cave.
beat them.......
Entrance and exit and blocking draughts.
fly or walk to Vermillion city then go east through vermillion city keep walking and there should be a sleeping snorlax blocking your path and a cave entrance.
It Is A Kecleon.
from a hiker next to the entrance of mount mortar
You can get to the Viridian Forest in HeartGold by going through Diglett's Cave, an entrance to Diglett's Cave is in Vermilion City.
Use the walkthrough wall cheat.
There is no code. The secret entrance with the maids blocking it cannot be acccessed. Its just there to puzzle people i guess.
they are not but if they are,try the second entrance/exit
beat the Pokemon league and go back to the entrance
Finish the league and defeat red
ask me