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 ALL DS SYSTEMS THAT WERE RELEASED BEFORE THE 3DS ARE NOW OUT OF DATE!So THAT CONCLUDES MY ANSWER.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!
1) Buy a DS Flash card
2) Insert it into your computers SD CARD port
3) Download DScraft
4) COPY + PASTE it onto the Flash Card
5) Insert the Flash card into your DS
6) Run DScraft
7) Have fun.