This kind of shit is why Nintendo is nervous about online interaction. That "boy" is probably a 32 year old pedophile looking to lure a 10 year old autistic girl into bed... or worse. If something like that ever happens, Nintendo is going to be sued to the heavens and probably watch their entire company crumble from the bad press that will follow.
They shoot down the original SwapNote app on the 3ds years ago for reasons like that. A pedophile was luring girls to send him pictures of them