I start out with the IVs, using dittos. When passing the last stat that I want to pass, I will use a ditto with the correct nature, until I receive two good babies, a male, and a female with the proper nature. From there, I breed until I'm satisfied with the results.When you professional breeders make babies, do you do natures first or IVs? And do you usually find a good ditto to keep breeding with? or do you try to get two decent-ived parents of the same species?
For more in depth information, check out this awesome breeding guide.