1) You can tell what IVs are maxed by talking to the guy in the Pokecenter in Kiloude City, the town that unlocks after you beat the E4.
He will describe them as "can't be beat" if they're indeed perfect.

2) Friend Safari. Every pokemon there has 2 perfect IVs (31)

3)Synchronize.
http://www.serebii.net/abilitydex/synchronize.shtml
If your lead Pokemon has this ability, wild Pokemon have a 50% chance of copying his nature.

4) Everstone
Passes the nature of the parent that holds it 100%

5) Destiny Knot
Passes 5 random IVs between the parents to the baby

----Getting yourself set up----

Most important part in my opinion. Remember that you're dependent on friend Safaris and such which might not always be there. Better start stocking up right now on useful breeding tools.

1) Get the Destiny Knot, it's in Cyllage city, in a hote, a maid gives it to you
2) Get Everstone. In Geosenge town, or wild Roggenrola.
3)The key thing is access to Safari Dittos. Find someone here with Dittos.
What's particular about those Ditto are that they come packed with 2 MAXED IVs as mentioned above.
Stock up on useful ditto. Get yourself some good natured Ditto of all kinds, get as many IV combinations as possible.
Best thing to do is to then rename them to those IVs so you remember it.
Check their maxed IVs checked, then rename them accordingly. [EX: HP ATK SPEED ditto]
-NOTE- Try to get Dittos with 3 maxed stats, best.


It could come very handy in breeding.
Easiest way I found is access to a Psychic type Safari with Xatu and Munna and shit.

Got your shit.
Now let's start breeding.

Step 1: Acquire desired mon Get yourself that desired Pokemon. Just the species is enough at this point. Let's say I want my Froakie. Got it.
Step 2: Get desired nature. Either breed it with ditto or something else that has the nature you want [everstone] or just breed a bunch until you get it.
So I want my Timid Froakie, well, got myself a Timid ditto, gonna breed it.
Step 3: Use that desired nature mon@everstone with a ditto@destiny knot [of desired IVs]
In this case I have my SPATK SPEED ditto and my Timid Froakie.
Step 4: Breed a few until you get a babby with the desired IVs all passed down
Got myself a Timid Froakie with 31 SPATK 31 SPEED now.
Step 4: Now breed that baby with desired IVs@everstone with another ditto with other desired stats@destiny knot
Gonna breed it with my HP DEF SPDEF Ditto now
Step 5: Keep breeding, this part sucks cause it takes a while, but eventually you get a decent balance of stats passed down
Step 6: Got myself a new Froakie, Timid, with HP/DEF/SP.ATK/Speed all maxed out.


Notes:
1) The key part is getting Dittos with 3 maxed stats, really. Just hunt them in the Safari.
2) Hidden Abilities will pass if one of the parents has them, but at a rate [like 50%? I'd guess]
3) I didn't cover breeding for attacks, the essential idea is to find a male from the same egg group that can learn the move as your female desired Pokemon.
4) What can make your life easier is if your desired mon is found in the Safari, cause that's 2 guaranteed stats.
Hunt a few with Synchronize till you find the 2 stats you want, this cuts the work by a lot.
You then have the nature, 2 IVs from that guy, and 2 IVs [or 3 as you should] from the ditto.