So my Mario Kart DS wasn't connecting to the internet. But wi-fi worked with pokemon and such. So i solved it by changing my Wi-fi settings from WEP-OPEN to WEP-SHARED for some reason Mario Kart DS isn't compatible with Wep-open... So your wifi needs to be WEP-SHARED Just wanted to share with you all. Cause Mario Kart DS wi-fi is great. If you need to know how to change your wi-fi settings, feel free to ask.