No, but it is illegal to download ROMs, BIOS files or any unauthorized copies of DS games.
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Well, you need to be jailbroken with Cydia, but that will void your warranty. Also, there is not an emulator for the DS yet on the iPhone, but I've seen footage of one (Doesn't work very well/probably fake). Also, emulators are illegal.
You can't because Pokemon Black and White is meant for the DS. It has two screens whereas the visual boy advanced emulator only has one screen. I suggest you download a Nintendo DS emulator if you want to play B/W, though.
check the settings of the emulator, there might be a setting for that, otherwise you'll have to buy the game.
no get a life.