I get through to step 14 just fine, no issues that I'm aware of since I've done the same with the original injector, PC editor etc. But after injecting the save, the game freezes if I open the PC. The X menu also comes up blank, and for some reason my game progress was reset in some way (I walked outside Battle Maison to see the entrance scene again).
Looks like at least one other person has had their game freeze while opening the PC, so I'm not alone.
It's getting late so I can't mess about anymore, but tomorrow I'll try injecting an unedited save to see if there's something wrong with my method. If I'm screwing something up in the editing process, I'm not quite sure how - the only thing I've done is to inject a few pokemon into Box 1, all legal hacks of course.
EDIT: tried importing a clean save, no issues there. So I guess I'm back to square one...