Yes, it's available for virtual console.
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On wii\64 L+a on ds I forgot
For virtual console through the wii shop channel. there is no "disc" or "wiiware" form of it.
Did you mean New Super Mario Bros.? Yoshi isn't in that, but he is playable in Super Mario 64 DS, and you can ride him in New Super Mario Bros. Wii!
Yes, you can buy it from the Virtual Console on the Wii Shop Channel. It costs 1,000 Wii Points to download.
Go to the shopping channel, then press virtual console and Nintendo 64. It's on that list.