Single post in Your Guide to 90%+ Breeding Pairs

The base (max of 99%) and the total are the ones you should focus on the most, the rest are to explain how you got from the base to the total. Adjusting the values of those is pretty easy Level gap can be fixed by getting each pokemon to the same level low level is fixed by leveling the pokemon up happiness, put them in a field that makes them happy/feed them happiness items as you can see with my alolan persian pair, you can indeed maximise how effectively they breed by knowing what to look for and how to adjust