I'm also experiencing that Error 13274. It worked once for a 5th gen Pokemon, but then when I tried to get some Pokemon from the 4th and earlier gens I get that error code. I'm testing now to see if other 5th gen Pokemon work. Yeah, I picked another 5th gen Pokemon at random and I got it no problem. Seems to be a problem with earlier Pokemon? The ones I was trying to get were Rhyperior and Dusclops.