You should have ask in this thread and look at the FAQ section my friend
https://forum.lowyat.net/topic/2696365?author=Kyoyagami

Anyway All 3DS/Wii U are Region Lock, Get a Australian 3DS since you're in Australia, its way easier to get your Aus games locally than importing other region games. oh and don't get a DS (unless collecting purpose), the 3DS is backward compatibility with almost all DS games.