From Bulbanews, your community Pokémon newspaper.
Also features SDHC support
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A new Wii System Update, Wii Menu 4.0, has been released to the public. This update lets users launch channels, such as WiiWare and Virtual Console titles, to an SD card. This update also allows the Wii to support high capacity SD cards.
Multiple Pokémon games will benefit from this update: the two current games that have been released for download, Pokémon Puzzle League and My Pokémon Ranch, are now able to be transferred to an SD card.
Nintendo.com's page on the update