Watcher-S is an enemy in Final Fantasy X-2. It casts high-level magic, and is easily defeated by a physical attack. They do much more than that though. It follows its name, and watches your party, and reports the moves you used when in battle to the Machina Panzer. When you get to the fight with the Panzer, your attacks will probably get locked out. For this reason, it is important that when you encounter a Watcher, you always take it out first with regular attacks.