>>33055090I've bred plenty of non-OU Pokémon after I ran out of OU ones to breed.
Once you have a good enough base, it's easy. For example, just used my 5 IV Adamant Donphan and 5 IV Sand Rush Sandslash I bred in ORAS to breed a 5 IV Adamant Slush Rush Alolan Sandslash. Literally the first egg was perfect. But I bred a batch of five all the same.