Today I had a look at the dsistore just and there is a new app called nintendo 3ds transmitter... what it does is it helps to send your paid games from the store from the dsi/dsiXL to the 3DS...It can also do:
.send music
.send pictures
obviousely(←spelt← wrong ←maby&larr it will send it to the SD card
go and download it now, if I did not mention, its free
By @jack.morgan21
If anyone is on a Dsi™ please read on 
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