Yes you will need a flash cart such as an R4 or CycloDS Evolution. You can't just plug a micro SD card into the DS. DO NOT call Nintendo and ask them about flash carts!
I suggest the CycloDS Evolution. Google it. It is by far the best flash cart you can get.
Also, I suggest you read up on what flash carts are and how they work. Start here:
http://www.europe-nintendo.com/forum...r-dummies.html
Good luck.
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