Such a great hack, and I'm still pretty early in the game. The level increase of the opponents is a bit steep, but i don't mind training and good old fashioned grinding ;) Taking me FOREVER to find a squirtle in water cavern, starting to think there are no squirtles here anymore :( darn 1% encounter rate haha didn't take me this long to find cyndaquil. so far i've started with gible which is now a gabite, caught a zubat that will become a crobat [and my poison pain in the butt for my opponents ;)], got a quilava, and i aim to get a squirtle, ralts (gallade, sort of my signature) and i haven't decided my final pokemon, any suggestions? Anyways, GREAT hack DRG, and, depending on how long it takes you to complete and how much more info comes out, have you considered adding the gen 6 starters/legendaries to part 2? obviously it would depend on info on their second and final evolutions and sprites that you can actually use for them becoming available, but it would be cool and tie into the "new region" in part 2 well, just a thought :)
EDIT: Also, i enjoy trying to recognize which pokemon you replaced with sprites from gen 4 and on based on the sound they make, reminds me of "who's that pokemon?!" on the tv show haha so far the ones that have stood out for me are buizel (replaced hoot-hoot) and tynamo (replaced spinda). tynamo is especially funny because the game still generates random spots on tynamo like it normally does for spinda haha.