I know there's a really complicated method of doing so with the game cartridges, but I don't need to go that far. Unfortunately, my original team was lost a long time ago.

I'm planning on doing a Nuzlocke marathon all of the games, starting from RBY of course, and transfer the surviving bros to my OR copy of the game.

I'm going to be playing on roms, so all I want to know is if there's a way to transfer mons from a GSC rom to a RSE/FRLG rom without manually re-creating them in some kind of pokegen-like tool.