An ominous-looking black orb has appeared on Skull Mountain. Go and investigate it right away!
This bounty is available to complete after beginning Errand 131.
As with the Red Dragon, it will cast Dragon Scales to boost its magic defense. However, there are no quick tricks to dealing massive damage this time, so boost your familiars' strength and attack normally.
Defense-wise, ALL of his attacks will do MAJOR damage to your party, and if you get caught in the line of fire of his Dragonbreath, you can watch your HP disappear just like that. Make sure to use Defend and All-Out Defense whenever you see either Dragonbreath or Firestream coming.
Defeat it and you'll complete the bounty hunt, return to the Swift Solutions to claim your reward.