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Step 1
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First, you must go to Jubilife City. In the city, report directly to the
Poke Center (Red Roof). Go west from Poke Center. You should be walking 
through what looks somewhat like a alley. Continue walking left until you 
see a building. Enter the building. As soon as you enter, you should see a 
spinning globe on the left side of the building. Talk to the girl at the desk. 
She will ask if you would like to connect to the 
Global Trading Station. As you might have guessed. Select, "yes".

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Step 2
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After logging into the Global Trading Station. You should be logged into it's 
main menu. You will see 3 options: Deposit Pokemon, Seek Pokemon, 
and Exit. Select Deposit Pokemon. And since this is your first time 
preforming this glitch, use a Pokemon that has no value of any kind. 
Example: Bidoof, Starly, Shinx, Ect.

After you have selected your desired Pokemon, it will then ask 
you what you want for it. You need to always select a Pokemon Lv. 100
or higher. And always choose a Pokemon that no one would 
bother keeping. Pokemon from the Kanto region are alot more safer 
to ask for.
Example: Pidgey, Ratata, Caterpie, Weedle, Ect.

To learn more about what Pokemon to choose in order to obtain 
maximum security, Please refer to the article about:
"Preventing Your Pokemon from being Traded".

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Step 3
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Now don't think its over yet. You only completed the "EASY" part of the
glitch.

Once you have deposited your Pokemon up for trade, you will find a 
Loading Screen. It would say:
"Checking GTS's Status.....".
And if you look on the Right Side of that box. You will find a clock. As you 
might  have guessed, the clock is what resembles that your game is 
loading.  Well, this little clock here is the key to duplicating your 
Pokemon succesfuly.

Alright now the objective here is to shut your DS off 1 clock tick before
the loading completes.
Yes it may sound easy, but its not! The loading time completes at 
random times.  So it doesn't always finish loading at the same time 
it did last time. But if you don't want to find yourself in frustration trying 
to complete the glitch. Then I would suggest what I call:
"The 8th Spin Method".

Ok lets get started. We are going to try "The 8th Spin Method" together.
As soon as you enter the Loading Screen, you will see the Clock Hand 
rotating  around clockwise. Always count 1 Rotation whenever the 
Clock Hand reaches the top of the clock. NOT from where it first 
started. You want your Clock to go  around 8 Times.  
On the 8th spin, SHUT YOUR DS OFF.

If your Clock doesn't go around 8 Rotations the first time. 
Please Continue Reading. If it does, 
and you have succesfuly turned your DS Off as soon as the Clock Hand 
reached it's 8th Rotation, then jump over to Step 4.
You will be redirected to the main menu. The Menu should now read: 
Summary, Seek Pokemon, and Exit.
Select the Summary.
You will see that your Pokemon is now Deposited in the 
Global Trading Center.
Just hit the "A" Button and it will ask you if you want to Take
Back your Pokemon,  or if you would like to leave it as is.
Select Take Back.
Your Pokemon should now be traded back to your Game. 
Once you receive your Pokemon back. You have to attempt 
"The 8th Rotation Method" again. Just keep trying to get it to 
Rotate around 8 Times.  You will get it eventually.

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Step 4
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Once you have succesfuly completed "The 8th Spin Method"
turn your DS back on.
Select your Pokemon Diamond/Pearl Game. 
Once you press start you will receive a error message:
"Your file has been corrupted. Previous file will be loaded".

Don't worry, this is normal. Your file is safe because of the 
Double Saving Feature.

Enter the game like you normally would.
If you have completed the glitch correctly, you will see yourself 
walking out of the GTS Door.

Talk to the girl at the counter again.
Connect to the Global Trading Station as you have in Step 1. 
You are logging back in to check if you have completed the glitch succesfuly.

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Step 5
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When you reach the Global Station's Main Menu, you will have to go through 
2 simple steps in determining whether the glitch was a success.
If done correctly, you should have 1 Pokemon in your Box/Party, and the 
other Pokemon waiting in the Global Trading Station waiting for your to 
retrieve it.

--(-Test-1-)
The first option in your menu should read: "Summary". If it does, retrieve 
your Pokemon back into your game(You might wanna do this quickly, so 
that others would'nt trade for it) by simply selecting "Summary". 
Then hit the "A" Button and select "Take Back".
If it reads "Deposit" instead of "Summary". Then the glitch was a failure.

--(-Test-2-)
Once retrieving your Pokemon back from the Global Trading Station. 
Log out to complete your final test in determining whether you have 
completed the glitch succesfuly. After logging out of the 
Global Trading Station. Look through your Party/Box to see if the 
Pokemon you duplicated from is still there. If it is, you have succesfully 
completed the duplication glitch!!

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Step 6
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This is the simplest yet most important step. Save!!