This started occurring after I had accidentally removed my SD card while PKHeX was still open.
I checked to see if I could still open the sav files before putting the SD back in my 3DS. I imported the save into the game using JKSM, and when I launch the game the error message states "Save data was corrupted and will be initialized."
When I import the old data that wasn't modified, the game boots just fine.
The problem now is that any changes I make give me this error message, where as before I was changing my save a ton without issues. It even happens on my Gold Version as well.
I downloaded the latest version of PKHeX, tried in the dev build too, and I even went and bought a new SD card in an effort to resolve the issue, but I still cannot modify any saves and import them without the save being corrupted.
Any help is appreciated. I searched on here using key words, so if there is a known fix for this I apologize for missing it.