- Download cheat database editor - R4CCE
- Run r4cce.exe and open the usrcheat.dat from the SD:__rpgcheatsusrcheat.dat
- scroll down to Pokemon White (any version should work) then right click > copy and right click again and paste.
- scroll down to the bottom of the list and select the copy you just made.
- You can then change the game title to something more meaningful.
- Click on the ... button near the (Dup?) button.
- Browse for your Pokemon White ROM.
- Finally click File > Save.
this is the guide i found on the forum, haven't tried it yet, will try it myself later. hope it works.