Need Help with my confusion!

[nandawin]

I just get into trading with other people and socialzing not long ago. So, what make me confuse is region thing.
Mostly regarding with the Events Code.
I have an Australian 3ds system. So, will i be able to claime the code that are from Europe or Japan.
this is because, one of my friend from europe offer me to give me his leftover code.

thanks in advance.