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Basically, it involves exploiting the Cloning glitch to obtain all three of the Johto Starters. If and when I get around to producing a GSC hack, I'd like to incorporate a tribute of sorts that will allow the player to get all three Starters legitimately. The question is: how do I go about it?
By learning how the GSC script system works. That's something you'll need to become familiar with in general if you plan on making a Gen 2 hack, and that should be a simple task once you are familiar with the basics of scripting. There should be a number of tutorials in the Gen 2 section that deal with scripting in Gen 2.
Check them out on Github