JUST SHUT UP PEOPLE. ALL DS SYSTEMS THAT WERE RELEASED BEFORE THE 3DS ARE NOW OUT OF DATE!So THAT CONCLUDES MY ANSWER.
==IF you STILL want to get Minecraft on ANY ds, READ THIS!
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Buy a DS Flash card
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Insert it into your computers SD CARD port
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Download DScraft
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COPY + PASTE it onto the Flash Card
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Insert the Flash card into your DS
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Run DScraft
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Have fun.