Normal: "A relative of the fiends found in the Mi'ihen Highroad colony. Though similar in appearance, it avoids their communal lifestyle. It is adept at water and ice magic." Oversoul: "A relative of the fiends found in the Mi'ihen Highroad Colony. It avoids the communal lifestyle of the other bugs. It likes to pick a specific dressphere to focus its attacks on." — Scan
The Critical Bug is an enemy in Final Fantasy X-2. A strong enemy that appears very late in the game. When Oversouled, it is best to quickly kill it before it attacks, as it can target nearly any dressphere with its Hater and Payback abilities. Inflicting Poison is an ideal start to the fight, as well as using a Light Curtain to reduce the damage of its physical attacks. Having several Mega-Potions and Phoenix Downs is advisable.
To enter the Aeon Cup in the Fiend Arena, the player must capture and raise the story levels of eight special creatures. These creatures will immediately be available to be released upon capture, however, what the player has to do is raise their story levels by three and then release them. This will change that particular creature into an aeon. The Critical Bug is one of these eight creatures; capable of being changed into Yojimbo.