Instructions
Turn off the Nintendo DS and insert a memory card (if the game file is not found on the device's internal memory). Turn the device on. If the file is on the system's memory, skip to Step 2.
Select "System Settings" from the Nintendo DSI menu using the stylus.
Choose "Data Management" using the touch screen.
Select either "System Memory" or "SC Card" with the stylus.
Click on "Petz Horseshoe Ranch" on the touch screen.
Select the file you wish to delete.
Tap "Delete." Confirm that you wish to delete this file. Repeat as necessary. Return to the main menu.