Pokemon Black and White

Official Guidebook
Here

Download backup for your original rom

Pokemon White
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Pokemon Black

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Still have a problem, see instruction here :

1. Download 【Dicastia_AP-Patch】

2. Extract them to a new folder

3. Drag the ROM onto the Dicastia-Patch.exe

4. Click Yes then click OK to finish (from dicastia.com)

 

I found some tips (credit to Footix)
DSL WFC Setting Tutorial
Tools and materials:

• Internet Connection 
• Wi-Fi Modem (I used TP-LINK TD8901G)
• Nintendo DS (can be any type)

settings on the computer:

• incoming network connection
• right click on the wireless network connection, properties
• select the tab "advanced" select "allow other network user to the connect through this blababla"
• Now select the tab "General"
• select internet protocol (TCP / IP)
• select use Following ip address:

           o IP address: 192.168.1.59
           o Subnet Mask: 255.255.255.0
           o Gateway: 192.168.1.1
           o preffered DNS: 8.8.8.8

setting in the NDS:

• go to nintendo WFC settings
• select the nintendo wi-fi connection setup
• select connectionnya
• insert the name of the wifi connection 
• enter your password (if any)
• auto obtain ip address "NO"
• ip address: 192.168.1.159
• subnet mask: same as in computer
• gateway: same as in computer
• Auto obtain DSN "NO"
• Primary DNS: 8.8.8.8
• Save the settings
• Test Connection

If the test result "Connection Succsessful"
enjoy your wifi connection on the DS 

good luck