I kept killing them with my pokemon that stops kung fu, and then the chosen one with the scrappy ability finally came to stop me. Of course, in my case the Pangoro ended up being female and I captured it.
Female is preferable if you intend to breed a HA pokemon with good IVs. I don't really have any ideas of how to use a scrappy Pangoro personally. I can see a use for HA ghosts though.