New DS(I) Secret found. Also includes Lite and XL
I found it myself. Below is how to do it.
1.Get two ds(i)s (Can also be for exeample one Ds lite and one DSi) 2.Put one on top of the other. 3.Start the one on top up only. 4.Now the Screen shall flash and then turn off (If this does not Work move the Ds on top a tiny bit to the right).