download digimon dawn 4 emulator?

Answer 1

Did you mean "Digimon Dawn"?

You need a Nintendo DS emulator. You can find them here:

http://www.emulator-zone.com/doc.php/nds/

You will also need the ROM for it. You might find one here:

http://www.dgemu.com/index.html

But it hasn't been released yet in English, so they may not have it yet.