Clutterfunky

Uh, go to your computers File Explorer, and search for 'Saved Games' in the bar on the top-right corner of the window. Open that, then open the folder labeled 'Pokemon Reborn'- you should find a file named 'Game.rxdata' and a number of files whose name read '(No. of save)-[CharacterName]-[PlayTime]-[BadgeCount].rxdata'. the latter are your backup saves.

From there, you rename the most recent backup 'Game.rxdata' and delete the original. When you next open the game, it'll be as if the backup was your last save.

Edit: If I didn't help much, perhaps this guide on the forums will?

 maybe try patching your game to the newest version? 

Oh thank god, it worked. I couldn't find it at first so I was really worried, thank you so much.