This can be used with RBY AND GSC.
I don't really expect this thread to get any replies (and probably a minimum amount of views since nobody plays GSC anymore), but I thought I'd just throw this out here in case someone actually does care.
I recently discovered a product that can back up saved data AND do your cheating all in one device. It is called Monster Brain, and it can be found on EBay for a relatively cheap price. I got mine for $1.29 + shipping, but it seems to be slightly less common and more expensive now. I made a video on it located
here, but since my camera sucks floppy donkey

, I'm going to break down all the things it can do in text. All pink text is GSC exclusive.
Start Game
-> Starts the game, pretty self explanatory.
Colourizer
-> Doesn't work. Broken function.
Blast Off
-> Doesn't work. Broken function.
Editor
-> Edit your name
-> Edit your rival's name
-> Edit properties
-----> edit money
-----> edit time
-----> edit badges
-----> edit clock
-----> edit ID #
-----> edit seen dex
-----> edit caught dex
-----> edit Gear
-----> Allow Fly
-> Edit Monsters 1 through 6
-----> edit monster type
-----> edit monster nickname
-----> edit gender / type
-----> item held
-----> store as egg?
-----> monster status
-----> current HP
-----> max HP
-----> level
-----> EXP points
-----> ID #
-----> Original trainer
-----> Technique 1
-----> Technique 2
-----> Technique 3
-----> Technique 4
-> Edit pack
-----> edit items
-----> edit balls
-----> edit key items
-----> edit TM/HM
-> Enter Poke [broken function, does not work]
-> Save changes
Memory
-> Backup (backs up saved data)
-> Restore (restores a file saved in the monster brain to the cartridge inserted)
-> Delete (deletes a backup)
-> Erase saved game (erases saved game on the cartridge (!))
Honestly I think it's a great product, and if you hate when your game randomly corrupts your data, I highly suggest getting this. It's also good to edit your Pokemon and items and makes things a lot easier.