So this may work or not. So uf you get a R4 hacking card you could use the internet on a ds/ds lite [comes with R4] and download a hacked minecraft from a website just enter [download minecraft free online.]
Also if you have a dsi dsi xl or 3ds get pettit computer and you could make a simple minecraft proubally 2d with no portals fancy graffics mobs color or armour and you would have to limit minirals but if you have homebrewed before you could proubally make it better then my explination.
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From the official website:DScraft is a DS homebrew adaptation of the popular game Minecraft. At the moment this is a rather complete adptation of "creative mode" (or minecraft Classic), which means there is only exploration and creation in this version.