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well PKHeX loads the save perfectly, but I suppose some other sector of the save that PKHeX doesn't validate causes the game to not want to read it. Yeah, could be your SD crapping out

The records related to what you've done (like how many you've caught, how many you've evolved, etc), the daycare, and the fusion mons were the most obvious entries. So all I did was replace those from your main-new. Didn't even need to do anything else. So your PC, Party, trainer data, story flags should all be the same. Potentially your SD could be corrupt, since if you did a regular extraction and SD transfer, the save should normally be fine. Glad to help, no worries.

@theSLAYER It worked! I can't thank you enough! So far everything works, I can't possibly know if everything is alright just yet, but the basics + online functionality seem to be functioning well, so the game isn't suspicious of the swap. Which values were off though? No need to list them, I'm just wondering what could have caused them to appear and which area they are in (story, pokemon, trainer data?), since I'm suspecting that my SD card may be on its last legs and corrupting stuff, this would definitely make me consider swapping it out. Anyways, thank you so much for taking the time to help

Try this: main-old Make sure it's named main when importing back into the game. The game was probably seeing your save as corrupt cause there are a heck load of values that seemed off. I may not have resolved all of them.