How to Complete My Little Carrot
This quest becomes available after completing Hellhound Astray.
The objective is to defeat Carrot, who is a Cassie. The other enemies in this quest (which you can ignore if you wish) are a Tonberry (absorbs Dark and is strong against all other elements), a Brown Chocobo and a Red Chocobo (both of which are weak to Water, Holy, and Lightning), and two Great Malboros, which are weak to Air.
The Tonberry has a move called Stalk. If it uses Stalk on one of your units, then the Tonberry can later use Karma or Knife to deal a huge amount of damage to that unit.