You will get the 2nd password from a scientist named Gideon inside Dotted Hole and here's how to do that: First use Cut on the door of Dotted Hole to open it, Second inside the cave fall down the hole and you should be in a room with four holes on each corner of the room and if you fall down the holes in this order you will reach the Sapphire Room: Up, Down, Left, Right. Lastly take the Sapphire and it should be stolen from you by Gideon and he will tell you the password and then leave. The password is Yes nah Chansey.
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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.
The second password is "spatial."
Answer:Have a Pokemon use the HM move Cut on the door.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM