check the settings of the emulator, there might be a setting for that, otherwise you'll have to buy the game.
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no get a life.
I don't know. But you can play it in a Nintendo DS Emulator.
No, but it is illegal to download ROMs, BIOS files or any unauthorized copies of DS games.
If speaking of a Nintendo DS, it is a ROM file. It's like insides of the game card packed into a file, bootable by the DS or an emulator.