Basically, your gonna leave the 6IV Destiny Knot Ditto in daycare for eternity.
That guarantees 5/12 IV's between parents will be passed down.
(If both parents have 6IV's you're guaranteed at least a 5IV and nothing less)
So a 0IV blubasaur breeds with ditto and you get 5 eggs.
Go to the judge in the pokemon center.
If he says "Stats like that, they simply cant be beat!" then its IV in that stat is maxed.
You end up with a 2IV bulbasaur.
Repeat & keep replacing until you get a 5 or 6.
Also an everstone will ensure the pokemon holding it passes down its nature.