All right. My advice for getting a Pokemon with decent IVs is to either hang about on Wonder Trade for a while in the hopes of getting a breedject (which I wouldn't recommend, even though you can get good Pokemon to start with this way), or by using the Friend Safari or the Dexnav in XY/ORAS respectively (for the Dexnav, try to get a Pokemon with high 'potential', that being three stars). Once you've gotten the Pokemon you want to breed, take it to the IV Checker in Kiloude City/Battle Resort.
Once he tells you what IVs are perfect, if any (he'll list 1-6 stats and may say that they can't be better), you might want to mark it. The easiest way to do this is through marking it. In the breeding community, each of the six marks stands for a perfect IV, with the layout being HP/Attack/Defense/Special Attack/Special Defense/Speed. It makes it infinitely easier to remember what stats are perfect.
To breed, you want to give the Pokemon with the ideal nature an Everstone, and the other Pokemon the Destiny Knot. The Destiny Knot was given a new purpose in the 6th generation- it passes down 5 IV stats from both parents, with a sixth being randomly assigned. Once you've gotten Pokemon with better IVs than the parents, swap both out and try to improve the offspring's stats. Things get infinitely easier if you manage to get a 6IV Ditto, so I would recommend trading for one, equipping it with a Destiny Knot and keeping it in your Daycare permanently unless you want to breed for Egg Moves.
Sorry for my late reply; I had to go. I know you have a guide, but... I'd kind of feel bad if I at least didn't provide you with an answer.