In order to pass into the cerulean cave in Pokemon firered/leafgreen you must first be the elite four champion as well as have found and given the ruby and the sapphire to celio on one(1) island. after completing those tasks go to the cave and the guy will be gone. Inside you can catch Pokemon whose level vary from 40-70 and here is where you also catch mewtwo. If you want to find strong Pokemon(65-70) use a max repel and only those strong ones will pop up
Go from the entrance to the exit.
it is water fall and it is in ice fall cave
it is in ice fall cave on four island but you need to find it somewhere in the cave
There isn't one. You can find Typhlosion in Lyra forest and Blaziken to the west of fall city.
fire cave
go through the fire cave beside the cart that takes you up the mountain
there is no diglett cave in Pokemon ruby only in leaf green and fire red
After you beat the Elite Four go into Cerulean Cave and follow the maze and you WILL see Mewto standing at the end of the maze!!!
go through digletts cave
go to the fire cave
Icefall Cave is located at four Island.
You Can Go Into This Cave Once You Have Beaten The Pokemon League. Cerulean Cave Is Where Chanseys And Mewto At LVL 70.
use cut on the door then go left then up then rite then down in the holes.