WPA protection is a form of wireless security that some wireless internet connections use. If you try to connect to a WiFi network with WPA security using the normal options in your Nintendo DS, you’ll find that the system will not recognize the connection or allow you to connect. You can access a WPA network using the “Advanced Setup” option in your DS. Note that to connect to a WPA network, you must have access to the WPA passkey or password. Writer Bio

How to Get WPA WiFi on the Nintendo DS  9 Steps  - 72