Digital titles don't transfer to DSi XL
Stingy
DSiWare games purchased on an original DSi cannot be transferred to a new DSi XL handheld, effectively requiring a second purchase if you want the same game on your newer device.
Nintendo has no plans to allow you a second download of DSiWare games you've already purchased, instead demanding that you pay a second time if you want to have downloadabled games on a new DSi XL.
Unlike iPhone, iPod touch, and PSP games downloaded from their respective digital stores, DSiWare games can only be downloaded once. If you have multiple DSi handhelds, you cannot share the game among them.
A Nintendo spokesperson told Kotaku that the company is "looking into that specific topic," but with a successor coming within a year don't expect a solution soon, if at all.
