Hey, Bleach Dark Souls won't save!

Yes, it's a fighting game.First time I played it, it seemed fine. When I got back to it to continue Story Mode, it says:"Data is corrupted and will be deleted. Press A to continue."Did that, then got back to it again, same message.Then I deleted it from the microSD, and added it again, save file and all, and it still is won't work.Using a DSTT.

Read the Common Issues thread:
https://www.romulation.org/forum/index.php?topic=1462.0Specifically the parts dealing with Save issues and NDS Flashcarts.

Does not work (arm7 patch)

Delete the save file.
Make sure you have the latest Firmware, check www.linfoxdomain.com/nintendo/dsStart with a fresh, unpatched ROM.
arm7 patch with the arm7 file from a ROM you know works on your card
If that doesn't work, try again with another ROM's arm7 file.That's really all you can do.

Well that sucks monkey fuck, cause I tried everything.