Choose save, and when it says "SAVING, DON' T TURN OFF THE POWER" turn it off. Turn it on again, and you will be asked what the password is, the password is your trainer ID.

To duplicate your pokemon, put into your pc, then choose change box. When it says "SAVING, DON' T TURN OFF THE POWER" turn it off, when you turn it on, you will have two off that pokemon. If it was holding an item, the item will also be cloned.