Your WEP key is the security key for your network. Check your router settings. What kind of router are you connecting to? Sometimes the router will have a default WEP key on the label.

If you give us the model number of your Netgear router, we can give you specific instructions on how to access the settings.

I mean the model number, like MR313, WGM124, etc.  The list of Netgear model numbers are here.

BEARDEDONE  wrote:

However, the security PIN may be your WEP key....

Nevermind, the security PIN is for Wifi Protected Setup (WPS).  You must have used WPS to connect your other Wireless devices.

Try routerlogin.com.

Username is admin, password is password or admin.

Look for something like Wireless Settings (maybe under the Setup label).

You should see your WEP key somewhere around there.

Do you mean it was set to WPA, or that you just set it to WPA?

Platinum and every other DS game other than Black and White don't support WPA. They only support WEP.

If you can, change the security to WEP, and use the given key as your key.

But do note, changing this will require you to change the wireless settings of everything else you own. Computers connecting via Wi-Fi, a Wii, a phone. Everything. Also note that WEP isn't that secure, but it's decent.