So I've been having this issue ever since I first got my 3DS a little more than a year ago... Whenever I want to play Pokemon (Pearl, HeartGold or White) with my friends by using Infrared or DS Wireless Communications, it always ends up with me having to use my old DS Lite instead because my 3DS simply can't find the ones I'm trying to link with.
Like, when holding our 3DS towards each other in order to use Infrared, it just keeps searching forever, never finding the other DS/3DS (it's the same with theirs when they try to find my 3DS, so it's clear that it's MY 3DS that is the problem). It's the same problem when we go to the Pokemon center on Pearl or HeartGold; whenever I pick "Become Leader" at the Link Station or "Join Group", nothing appears when we try to search each other up. The "Choose which group to join" - list is just blank... But as soon as I switch to my DS Lite, everything works just fine and our devices find each other immediately!
My StreetPass and Internet Connection works just fine, though. It seems that the issue only occurs when trying to link directly with games. I can play online with them when we're at two different places, but when trying to use Infrared or DS Wireless Communications: nothing. I'm really bothered by this issue, so I would really, really appreciate any help.
Thanks! 