Sonic Bombs, a good lance (or other weapon you're comfortable with), and knowledge of his/their moves (can't remember if it's Cephalos or Cephadrome quest). Attack the body, dodge/block the tail whack, and make sure to use Cool Drinks as necessary. Easy victory once you know what to do.
Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.