Hey,

Can I use 3 or 4 copies of Cubic Ninja with my Sky3DS?
I want to use one cubic ninja for ninjhax on my O3DS, one for my N3ds, one for OOT exploit.

It's for a long travel so I'll not have acces to internet to scan the QR codes...

Maybe I can prepare my sky3DS card with 3/4 CN with their respective save?

 

If you try to Write a copy of CN when one exists, it'll give a dialog which IIRC has the options, Overwrite, Add and Cancel. If you hit Add it should add another copy.
The copies have their own saves (though the easiest way I've seen to set the exploit is still the QR code) and good luck remembering which one's which.