Uh... GTS cloning, what you do is go to the GTS, put your pokémon up for offer, then trade the pokemon for something no-one will have like a lvl 100 bidoof, then as the little clock thing in the bottom-right hand corner of the top screen to show it's loading spins while it's saying 'Checking GTS Status'. When it gets to the full 8th spin of the clock (or around then) Turn off the DS. Go back on, don't worry if you file is corrupt, and quickly go back inside the GTS, get back you pokémon from Summary, and there.