>>15652813I've tried breeding both just spamming eggs en masse and doing the method in the jpg here. I'm not sure which one I like better, both have their ups and downs. If you use the one in this image though you can cut down on RNG a lot.
Protip: If you do use the method in that picture have two parents with 31 IVs in the stat you don't want (ie the stat you want randomed) that way you can tell if the stat is being passed on from the parents or randomized by checking it at the IV checker.