Hoopy, first off, thank you so much for the constant support and kind words. I hope you understand how far those go and they really mean a lot.
Now, the bad news: basically, by adding in a bunch of new key items pockets, the saveblock got modified, meaning it is no longer compatible with older versions. In prior iterations, the versions were "compatible," but you might've missed some triggers/events/etc. This update actually breaks older saves; if you created a copy of your save and tried to load into 1.13, the game wouldn't even function properly. I sincerely apologize for this :/
I could create a separate patch for you if that's what you wish; the only thing is that the enemy teams haven't been updated to have EVs/perfect IVs, nor are there mechanisms to change natures or expedite EV training. But again, I don't mind creating a patch just for your playthrough.