How To Connect The Nintendo DS and The Nintendo Wii

Along with the connectivity to the Nintendo DS games, a player can win Pokemon from this game and transfer them back to their DS games. This feature allows players to obtain Pokemon that are either hard or impossible to get without using a cheat device. An example would be the Pikachu that the player wins as an award for beating the game. This Pikachu knows the moves "Volt Tackle" and "Surf", attacks which are otherwise impossible to have at the same time, because Volt Tackle can only be obtained through breeding, and Pikachu is not otherwise able to learn Surf. Other Pokemon obtainable this way are Magmortar and Electivire (The earlier stages of these Pokemon need to be traded while holding extremely rare items, magmarizer and electrizer respectively). These Pokemon each require a special code to be entered before you can gain the ability to download them. Only the code for the Electivire has been released. Along with the ability to download Pokemon onto a copy of Diamond or Pearl, players can purchase items like certain Technical Machines, used to artificially teach a Pokemon new moves, and evolution items. - Wikipedia

The Nintendo DS and Wii editions of Galaxies can connect to one another wirelessly, allowing players to unlock an additional Galaxy to play in both versions. Both editions of the game can also transfer a version of Galaxies to a Nintendo DS via its Download Play feature. Retro Evolved is included in both editions of the game, allowing the player to play the game as it was released on Xbox Live Arcade (minus Achievements and Retro mode). Retro Evolved also supports the online leaderboard feature. - Wikipedia

The character you play in your Animal Crossing Wild World game can be imported to play in your Animal Crossing City Folk game! See the Animal Crossing City Folk instruction manual for details!

The Nintendo Channel provides all sorts of information for upcoming Wii and DS titles. In addition, it allows you to download game demos directly to your DS. You can download the Nintendo Channel for free by visiting the "Channels" section of the Wii Shop.