You will need xdeltaUI from the link below; xdelta 3 will not work!
Beta Patches (all are in .xdelta format). You need xdelta to apply this patch. (http://www.romhacking.net/utilities/598/)
How to apply patches using xdelta UI
- Open the "Apply Patch" tab.
- Click Open next to Patch and find the .xdelta patch that you want to apply.
- Click Open next to Source File and find the ROM you want to apply it to.
- Click '...' next to Output File and save your new ROM somewhere. Remember to add .nds to your file name.
- Your new ROM is ready to be run.
2/17/14- added Testing Room patch