That has happened to me before. You probably changed DSes since you first played the game. Whenever you do that, and you try to use the WiFi features, you game has adjust to the new settings (or something like that).
I have a few things to offer, like the three Musketeer Pokemon, a female Scyther for breeding little Scyther, and Tornadus to help you get Landorus. I got quite a bit, just ask me what you need. If I don't have it, I can probably get it in one or two days.