Well, probably not all the mini-games would go there. You'd find mini-games in other places as well.
The digging mini-game would probably be there too.
To increase confidence that this hack would be developed, I'm establishing a roadmap:
Mapping:
* Spriting the new tiles for new locations, like Hoenn and Sinnoh
* Actually mapping the locations (this can be done before ASM hacking the game)
* Inserting them into the game when there's extended space for them
Pokemon:
* Spriting the Pokemon sprites to fit in with the rest of the game
* Spriting in new Unown
* Setting base stats and stuff for them (Pokemon GSC's battle system is rather different from RSE's and DPP's)
* Adding in new moves (probably will need to make the moves byte at least 9-bit)
* Adding in the new Pokemon (definitely will need to make the Pokemon byte at least 9-bit)
Adding more later when I think of what needs to be done. Accepting suggestions.
Oh, and I had another idea: why not make the Pokemon eggs have different sprites? Like these:
http://archives.bulbagarden.net/media/upload/d/d2/SugimoriEggs.pnghttp://archives.bulbagarden.net/media/upload/3/34/Pokemon_Eggs.jpghttp://archives.bulbagarden.net/media/upload/4/4b/PokemonEggsAnime.jpg