Pokemon pearl how to delete old file?

1. Go to Pokemon (Put version here) Nintendo on the DS, DS lite, or DSi.

2. Press Up, B, and Select at the same time.

3. Press "Yes".

4. Press "Yes" again.

5. Be patient if you were very far in the game.

6. Once it is done, press A.

Congratulations! You have learned how to delete your saved game file.

But since you did, there is no way to restore the data that has been deleted.