to stop it from freezing i would turn the DS off and start the game again
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press x
press start
When your in game, press start, this brings up the menu, select save and exit, this will bring you back to the starting menu.
On the main menu, before you start the game, there should be an option that says "New Game" or something. Click it and play. Then, when you're done, just save that game and it will override your first one.
go to main menu where you load your file and try the down button and start or up and start