The rules are here:
http://entertainment.upperdeck.com/yugioh/en/gameplay/rulebook/rulebook_v06_EN.pdf
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You could play it on both. Any DS game can play on your DSi
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Best place to watch any episodes of Yugioh, Yugioh GX, Yugioh 5D's, and Yugioh Zexal is at the website 4kidstv.com
Series after: yugioh 5'ds is yugioh Zexal.
Go to Yugioh-cards.com to check for updates when new tuornament on yugioh 5'ds be out.