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.
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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
Yes there are shiny Pokemon in firered