Go to four island and go in icefall cave find HM7 use it to go up the waterfall go to the ladder beat the rockets talk to lorelei go to six island and go to dotted hole the scientist should be gone use Cut to open the door.
Dotted hole on six island.
you get the Sapphire in dotted hole (you use cut to get into dotted hole)
Once you obtain the Sapphire in Dotted Hole a scientist will take it from you then tell you the 2nd password for the Rocket Warehous which is Yes nah Chansey.
use cut
South on six island.
in the dotted hole on island 6
you've got to use cut.
In dotted hole on six island.
The Dotted Hole is an area exclusive to Pokemon FireRed and LeafGreen. It can be found in Ruin Valley on Fortune Island in the Sevii Islands.
You need to use Cut on the metal door
dotted hole is on the south side of six island. (the sapphire is in there) a little extra info: dotted hole does have braille in it.
get the ruby and sapphire in mt. ember