I read from a website that my router was able to work with it, Im also pretty sure it use to work I think it stopped working after I used the mystery gift option.Some routers just aren't compatible with the DS/Pokemon games. The Wii was made with a wider range of acceptable signals.
You can solve this problem by buying a gadget-thing to plug into your router/pc in order to translate the signal for you, or you can simply just buy a different router--but that would obviously be more expensive.