give the master ball to a pokemon. make sure there is a space in your party. talk to the woman at GTS and deposit the pokemon you want to clone. When the little timer pops up count how many rotation it takes to finish. next time around remember that number and right before its finished turn your ds off. Another way to see when to turn it off is to look at the WLAN light on your router, it will flicker at the exact time you should turn your ds off.