How can I fix this ds?

My DS game is corrupted, and I'm not sure how to fix it, if that's even possible. If so, how can I fix it?

• Specifically, it's a copy of Pokemon Diamond Version that someone got tired of and sold to me for two bucks a couple of years ago. I know that the previous owner mucked around with the game using an Action Replay. Nothing TOO wild, though there were several Explorer Kits in the Battle Items category. Some time after I got this game, for some reason (likely has something to do with its past in the Action Replay), the save function just completely glitched up. Now, although it says it's saving, it doesn't save, and when I go to load the game, it just says: "The save file is corrupted. The previous save file will be loaded." I even tried deleting that save file entirely. But when I start a new game, it curiously says "The save file has been erased due to corruption or damage." Moreover, when I save a new game and go to load it, it reveals that not only was that new game never saved, the older one was never erased! I am seriously perplexed by this. Would anyone at least have a good guess on how to fix this problem?

• Answer:

  Sorry, but the game is destroyed. Action replay can do that to games. The game will never work properly after it becomes corrupted like that.