What you will need.
• Access to the Global Trade Center [1< badge]
• A wireless router
Please Note: I wrote this guide for the cloning using a router, and wouldn't know about using a Nintendo Wi-Fi USB Connector.
• A DS and Pokémon Diamond/Pearl game pack with at least 2 pokémon.
Step #1
If you don't have access to the Global Trade Center [GTS], you are going to need your 1st badge to enter. Once inside, go to the PC and access BEBE's PC.
TIP: I use the "Move Pokémon" option, as you do not have to exit the BOX, you can simply shift pokémon in your hand.
Withdraw at least 2 pokémon, no more is needed. Then you need to head to the women over the desk and enter the GTS.
Step #2
Go to Summary, and select the Pokémon of which you wish to clone. For conditions, I suggest using Azelf; Lv. 9 and under; Either gender. Pause before you continue and position yourself infront of your router. On your router you should have a light that flashes when you connect to it.
TIP: I suggest you do not operate any other wireless devices ie. a laptop. This may confuse you resulting in you not being able to access the glitch.
On my router, it is labled "WLAN", but I am aware it is named things such as "Connection" or "Connected".
TIP: To test what light you need to watch, simply connect to your router with a device, or if you was watching it previously, you should have seen it flash as you logged onto the GTS.
Step #3
This is the most important stage of the cloning process. Once you are sure of the light you need to watch, press "yes" to confirming. Now, instead of counting, watch the light carefully. It may flicker once or twice during this process, but you should ignore it. After around 11 seconds, [the counting method is innacurate but it's a good reference] you should notice the light to blink rapidly. On my router [belkin54g] I have to wait for it to flicker 4 times then IMMEDIATLEY turn it off. If you are using the same router as me, you should turn it off after the 4 flickers.
TIP: If you find it hard to turn it off so rapidly, try after 3 blinks.
Step #4
Turn your DS back on. Once you pass the "PRESS START" screen, you MUST have a blue screen come up stating that the save file is corrupted. If this screen does not appear, then I'm afraid you have not succeeded in cloning.TIP: If this is your first time cloning and you fail missurably, my advice is to try, and try again :)
Once you pass the screen you should be back where you last saved [at the GTS desk, or walking out of the GTS]. From there, you re-enter and click on summary.
Please Note: If you happen to have had someone trade you a Pokémon, yet the "Currupt File" screen still appeared, you may have entered another glitch. You will not get a cloned pokémon back, but you will get the offered pokémon back AND the pokémon you "wanted" back. Amazing, I know :) [And it REALLY does work, I'm living proof and so it my Lv 100 Bidoof, which is why I recomend an improbable [Actually impossible except with hacking] Lv 9> Azelf]
You should come up with the offering screen, which you press A on, then "Take back". Once the pokémon returns, you should check the "Summary" option, so you can check if it has cloned without going back to a PC. -Zungie
......
That should about explain it.