I have the same game for the Gameboy and all I had to do was start a new game and the old one was deleted. I don't know if the same rules apply.
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You can't delete a game, as they are on the game cards. If you mean the data, you should be able to delete it in the options menu of that specific game.
The only time any GBA or DS game ever does that is if the cartridge (game pack) itself is damaged.
No, but you can save over them.
How do you delete a game in petz puppyz and kittennz game for nintendo ds
Go on new game and then it asks if you want to delete game, press yes. Then go onto new game again