I CAN'T GET NINTENDO WIFI ON NINTENDOWIFI.COM

Go to your settings then click on the internet settings and click add.

http://www.nintendo.com/consumer/wfc/en_na/ds/wrInitialSetupHelp.jsp

If fail:

Make sure that the wifi settings you have are connect.

See if you are able to connect to another wifi connection.
-Make sure you know the wireless settings for the other wifi connection.
-You may also want to try to connect to an unsecured wifi.

Hi there.

1. • Turn on your DS and navigate to the WiFi connection settings menu. On a DSi, click the wrench icon, navigate to the third page of options and select "Internet." On an original DS or DS Lite, select "Edit WiFi Settings" from the in-game menu. The game must be WiFi compatible to access the WiFi settings menu.
   • Select "Connection Settings."
     
   • Choose an open connection slot, which will be indicated by the word "None" next to the connection number
     
   • Select "Search for an Access Point."
     
   • Select your wireless network from the list displayed. Enter the wireless encryption code for your network with the onscreen keyboard.
     
   • Select "OK" when prompted to save your settings and establish a connection with the network.
     
   Let me know if you have further questions.
   

Thank you!

There are certain types of WiFi that can't be picked up by the DS Lite which prompts you error 51099. For example, you can't use a security protected WEP WiFi. I encountered this problem with my DS also and if you know how to remove the password on your WiFi router, that should solve the problem, however it leaves your network unsecured so I suggest doing that only to receive the event gift.
Nintendo also has a detailed troubleshoot guide for that error which I've provided a link below.
http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=51099&system=DS&locale=en_US
Cheers and good luck with getting Victini!

This is a very easy thing to do. Insert a game that is compatible with WiFi. Then hit the Wireless button, or, in games like Pokemon, diamond pearl and so on, the WiFi connection setup.It will look like a DS, or a WiFi symbol, witch is like semi circles on top of one another, getting bigger. From there just hit WiFi setup.

Something is wrong with your wireless router. I think Wii's connection to a router is WEP-Shared,or WEP-Open. Try all of the authentications. Ok,just follow this.
1) Load up Wifi Connections and stuff.
2) Go to your computer and go to this website nintendowifi.com
3) http://www.nintendo.com/consumer/wfc/en_na/routers/index.jsp Check out which router you have.
4) If you have any of these, your lucky. Just follow this: http://www.nintendo.com/consumer/systems/wii/en_na/getOnline/index.jsp
5) Also look under your router for the WEP key or whatever...
I hope I helped!
Sincerely, Frankwarrior.

If you are talking about the games that you can download directly from Nintendo you cannot do that with the DS Lite only on the DSi

Did you try to set up your Wi-fi connection settings or your not in a good Wi-fi connection zone.If that doesn't work mabey not made by or for nintendo.

Usually when you connect to Wifi, you automatically get a connection code. You do not usually need a code to connect... Something may be wrong with your DS's connection.

Please e-mail me at [email protected] so I can ask some questions for more info.