I have a Nintendo DSi. I've been trying to connect wifi to my nintendo dsi so I can wifi battle people. But it hasn't worked ever since I tryed months ago. I also have a NETGEAR router WNR200v2. I went under wireless settings, changed my settings to WEP. Then on the very bottom of the page it says Passphrase. On my piece of paper I got I made up a passphrase and its different from the one on my mode: Up to 150 Mbps g/n only. on my security options its on WPA-PSK [TKIP] + WPA2 - PSK [AES] right now. When I click on WEP the pass phrase never works and theres two different options of bits. Either 64 or 128 bits. Which one do I choose? Like none of my passphrases work. On my nintendo DSi and Wii my internet works only on Advance settings, but my wifi doesn't work. Like I'm really confused. Please help?

Use the passcode you made, and match the security type (WPA for WPA enabled router, WEP for WEP enabled router). But when doing so, get your DSi close to the router, leave all cellphone devices away from it. From my own experience with the DSi (not DSi XL, it has better wi-fi antenna), it needs to be really close to the router's antenna so it can establish the connection the first time. After you succesfully connect the DSi the first time, you can connect to the internet at any distance from the router as long as the DSi can capture its signal. Good luck.

Try then changing the router band (B/G thing) to Mixed (both B and G). Then try using one of the generated passcodes from the router, and always with DS system close to the router.