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Parting Shot is one of the best things about Pangoro. Which is sad because you can't PS with Assault Vest.
Pretty much always going to run Knock Off, Gunk Shot, and Drain Punch (Hammer Arm if Trick Room Team) with 4th slot good for flex.
"Standard" set would probably be Choice Band with Parting Shot. 252 Atk Adamant and whatever fine tuned bulk investment suits your meta predictions.
Scarf Set requires max Spe and nature which really cuts down on what you can effectively kill as well as making it dangerous to switch in on unresisted attacks.
I've seen a few Lefties Bulk Up variants be successful. Either eliminate the fairies before hand or predict the switch in with Gunk Shot because you really shouldn't be outspeeding.
Iron Fist probably >80% of the time. Scrappy is rather pointless since you have Knock Off (barring Sableye but you really should use a Fairy against that). Moldbreaker is situationally useful if you run up against a lot of Sturdy/Filter/Multiscale mons.