I just finished this a couple of hours ago and into the postgame area, I clearly see where the potential for this hack is squandered. The postgame area consists of only 3 towns and the cave areas here are mostly empty sans a few trainers and items. In fact, I noticed a lot of the side areas were like this. I only go there to find pokemon I didn't have then after that, I don't revisit the places. Besides the wonky BSTs for the starters, this is where the hack falls apart. It was nice to go through Nihon and all plus battling the gyms and even the surprise character for the E4 battles (won't spoil them here), but soon I think I'm done with this game as I really don't feel like breeding for the missing babies plus I still haven't caught Ho-oh or the roaming trio guys yet.
This was a nice but shorter than expected experience for me.