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I like the story line, and the fact that every legendary will actually have a part in the storyline, instead of being just put somewhere in the "world".
I can help with spriting/mapping if you need
spriting proof: https://www.pokecommunity.com/album.php?albumid=2373 GSC Revamps
mapping proof...
This seems like it would be hard to implement.
I would suggest actually not doing a hack but go over to Game Developement and do it that way.
Good luck anyway.
I suggest you choose other starters, Most starters don't require much expirence to raise then to the next level while pokemon like dratii and larvitar will take a long time to level anywhere.
Just my personal opinion.
Anyway I like the screenshots Looks good.