Japanese sets in general have better pull rates than English boxes do, though you're right in that you won't get a full set with just a couple boxes. 1 box of each X and Y (the Japanese are fond of these "double" sets) will likely get you a full set of all commons and uncommons, and possibly all rares, though you definitely won't get all EXes (only 2 EXes per box, and there are 3 EXes per set), and you only have a chance at getting an FA or an SR like BW's Shinies.
There are other traders here who trade Japanese cards as well, some of whom I've traded with in the past. Only one I can think of that lives in the Netherlands, but it's a nice option, and the actual postage you pay for trading with people in the States, etc. is often much more reasonable than the inflated shipping you tend to pay if you deal with sites like Ebay.
I wish you the best of luck with your pulls and I hope you enjoy opening your booster box!
It's a very fun experience.