Anyone that doesn't have netpass and swapnote should get it. Netpass is for getting more streetpasses and if you use it with swapnote you can send/receive letters over wifi.
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how do you set up netpass?
Download the cia or 3dsx from Universal-Updater you can download Universal-Updater by googleing Universal-Updater for 3DS
You are a legend.
What is Swapnote?