>>503827253 inherited and 3 random. The standard and less time consuming process is getting an abra/ralts with synchronize and the nature you want, level up to 41, buy a bunch of super repels and repeat balls, get a magikarp, switch to the acro bike and head to the cave where you get the second fossil. There you put your abra in the lead, get on the bike, use a repel and press B. Each time you find a ditto, switch to the magikarp and catch the ditto with a repeat ball. When you have at least 30 dittos go to the IV rater in BF, just north of the poke center, and check them all out. It's not that hard to get them with 1 and 2 perfect IVs.
https://www.smogon.com/ingame/guides/breeding_guide_part1https://www.serebii.net/games/iv-calcdp.shtml