Poké Classic Network is an unofficial replacement for the original Generation IV and V online services, re-enabling the GTS, Battle Videos, and more. It works with Wiimmfi for general-purpose NWFC emulation, and Kaeru WFC for SSL offloading. (Compatibility with AltWFC servers is not guaranteed.)

HOW TO CONNECT:
To properly connect to this service, you need to change the DNS addresses for your connection to the ones below.

Primary DNS:
178. 62. 43.212
Secondary DNS:
  0.  0.  0.  0

You can access these settings by going to the "Nintendo WFC Settings" option in your game's main menu, tapping the big blue "Nintendo Wi-Fi Connection Settings" button, then tapping on the connection you're using. You'll arrive at the "Connection Settings" panel.

Scroll to the bottom of the settings using the scrollbar, set "Auto-obtain DNS" to "No", then edit the "Primary DNS" and "Secondary DNS". Once you're done, tap "Save Settings". Tap the "Back" button twice, and you'll be back at the game's introductory sequence.

After completing these steps, you can start playing as normal, and you'll automatically be able to use the Wi-Fi features of your game.