it doesn't matter so much if you get one that's the wrong region, you can email the company and fix it. just don't buy the pro version, it's more expensive and it's the exact same thing as the regular.
I got mine off of amazon, it was the correct region(us) and I've had no problems.
edit: this is what I got. http://www.amazon.com/gp/aw/d/B00CQ9L1Z6
http://www.amazon.com/gp/aw/d/B00CQ9L1Z6?vs=1 so this is datel's powersaves?
Yup you bought the wrong one. The correct one to buy as at this link::
You try shipping from the US?
Amazon US
Oh dear God, what are those on the front!? Xerneas and Yveltal, what happened to you!?
Anyway, I've heard that there's no difference between the Powersave and the Powersave Pro except that the pro is supposed to be the American version and the other is for all other regions. Not sure if this is true. If your 3DS is PAL, I'd go with the non-Pro version, otherwise go with the Pro.