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Do you mean codes as in cheat codes or the internal coding of the game? If you're talking about the latter, yes. Check the RomHacking/Pok?mon GB Emulation forum if that's what you want.
Of course you can. ANYTHING can be changed(feel free to challenge me on that), except time...cause no one knows whats gonna happen..XD And the game code can be changed with the right "equipment", but I'm no pro at that.
Do what Simon says (XD): Go to the ROMhacking section. The poeple there know all about that kind of stuff, and they can show you where to get the equipment and how to use it. ^___^