Well, depending on the female. I found some do a slow and intent move towards another betta, almost stalking... Others give chase, and others even flare. Once they establish themselves there may be occasional chasing and flaring, which technically flaring is a form of communication not aggression.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.