you either buy your games in a store, or you download them from torrent sites, which is considered illegal by most people. Assuming you mean "illegal downloading" you'd have to find a torrent site (such as mininova, torrenz, isohunt, you name it) and download the game using a torrent programme. You burn it on a DVD and put it in your wii (assuming that you have already installed the appropriate software, if not, try googling "homebrew channel" and follow the instructions)
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The only way to play older Nintendo games on the Wii is to purchase them through the play store and then download it to your Wii. There are many different old games available for purchase there.
You download them off the Wii shop channel, which lets you play them on the Virtual Console.
Yes, you can still download games Virtual Console games from the Wii shop and play it on the Nintendo Wii.
As of today, it is not possible. Not even for the DSi. Sure you can use DS Download play using a certain Wii channel to play trials of new games, but you cannot play Wii games on any current version of the DS. There are some titles that are in both the Wii's and DS' library, but that is completely irrevelant.
the wii, saying that you can also download old/unreleased video games. Plus, if you have facebook, you can play games on that while on your wii if your wii is connected to the Internet and you have the Internet channel.