It's tedious but it usually only takes an hour max to get a good Mon when you have a perfect Ditto. Catch one with a personality you want using a Synchronizer or breed until you get a base with the personality you want, then switch out as you get progressively better IV kids.
Once you have a 5 IV parent and the Ditto, there's a small chance for 4/6 IVs and the rest of just hoping your 5 IVs hatchlings have the dump stat in the correct place.
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