Pokemon Diamond Discussion
Select the pokemon that you want to clone. Give it any items needed too. Put it in any of your boxes.
Now, go to the GTS. Talk to the lady and enter. Put up a pokemon for trade (NOTE: Try this with a low-level pokemon who doesn't have an important item first). When it takes you to the loading screen, watch the little clock on the bottom-right part of the screen. Count how many times it hits the top, and note where it was when the pokemon was uploaded. Go back to the summary screen, and take out the pokemon. Once again, watch the clock.
Most people's clock stops moving between 7.5 and 8 rotations.
Now, put the pokemon that you want to duplicate up for trade. Right before the clock gets to the interval where it changes, turn off the DS.
Turn it back on, and load the game. You will probably get the error screen, but don't worry. Continue to load the game, and go back to the GTS. If you performed the glitch correctly, the pokemon will still be up for trade. Take it back, and leave.
Now, go to the PC to the left of the counter. Load it up, and check your boxes. If you performed the glitch right, you will have duplicates of the pokemon (and possibly item) that you tried to clone.
If you didn't get it, try, try again. It took me about 13 times to get it. Just keep trying.
NOTE: This glitch is very risky. Several GameFAQs members have reported it to screw up their game. Several other members reported their pokemon being traded before they could get back to it. Though the number is very small (about 3/100 people), it still is a risk. Don't say you haven't been warned.
To prevent the second problem from happening, request an evolved pokemon that is level 9 or lower (eg. Infernape).
I just submitted it as a cheat. And trust me, it works. Two level 100 Dialgas, and having two masterballs = WINNAR.
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