I don't think u can
Chat with our AI personalities
you have to delete the hole game its self and then get it back on your d.s but you also have to delete the saved data.
make a new file and save it
Delete all of your saved data as annoying as it may be.
To delete any saved data on a hard drive, just go into the memory settings and delete whatever you want.
go to the home menu then go to other then press delete save data then it will say OK are you sure? press yes it will say all of your saved data will be earsed is that ok? press yes then it will be deleteing it then it says your data has been deleted ( PS all i have is Pokemon mystry dungon expores of sky o_0)