Step 1:
Download Pokemon Diamond/Pearl [Patched] from GamersFire.net (You must be registered to use download system):
Download Pokemon Diamond/Pearl Patched Already!
>>Registration Required. REGISTER HERE TO DOWNLOAD
Then Extract it using 7Zip:
http://www.7-zip.org/
Step 2:
Download no$GBA:
Here
Step 3:
Open No$GBA, Load Pokemon Diamond/Pearl.
After Loading, Do not play the game, immediatly go to Options>Emulation Set Up
Under NDS Cartridge Backup Media, select "FLASH 512 KBytes"
Next go to the Controls Tab in the same window, Select your Keyboard settings press ok.
NOTE: This step is VERY Important!! After you are done with the above go to Tools> SAVE OPTIONS
Step 4:
Go to File>Reset Cartridge,
Have fun playing