A strange black orb is floating in the main hall of the Porcine Palace... This probably isn't a good sign. Go and investigate!
This bounty is available to complete after beginning Errand 131.
As with the last two Porco fights, this mechanical beast is weak to storm, so let your Drongo-based familiar have fun with its storm spells for some decent damage. Strong familiars with the Bluster Blades equipped will also be able to do quite a bit of damage.
Keep an eye on your HP, and the attacks the Porco does; its Gammon Cannon will DEVASTATE one character in your party, so if you see it coming, Defend and order an All-Out Defense. Other than that, its attacks aren't very threatening, so just chip away at its HP until it finally falls.
Defeat it and you'll complete the bounty hunt, return to the Swift Solutions to claim your reward.