Hooktail

Hooktail is a dragon that has terrorized Petalburg and ate many of its residents who came to her castle to slay her, like Professor Kolorado's dad and Koops' dad. When Mario, Goombella and Koops came to her castle to obtain the first Crystal Star, the Diamond Star, they learned she got food poisoning from something that starts with cr- and ends with -icket. They learned her weakness was the sound of a cricket's chirp. Upon reaching the tower, they slayed her, but before Mario and his team can finish her off, she swallowed some of the audience members to replenish 10 of her HP. Mario and co. defeated her and freed Koops' dad, who was swallowed whole and obtained the Crystal Star, which Koops' dad found in her stomach. She has two older brothers named Bonetail and Gloomtail. It was not revealed that Hooktail was female until the fight with Gloomtail, who attempted to defeat Mario and his friends for slaying his sister. Hooktail resides in Hooktail Castle, while Gloomtail was in a chamber in the Palace of Shadows, and her (presumably oldest) brother Bonetail was on the bottom of the Pit of 100 Trials.

According to the storyteller in Rogueport, the three siblings were once the pets of the Shadow Queen.

Stats
HP: 30 (Has 20 HP, but eats some of the audience members to replenish 10 HP), Attack: 5, Defense: 1

Tattle: That Hooktail! It'll stomp and munch on you, and it has a more dragonish attack: stinky, fiery breath! It's tricky, especially when it's losing, and it'll try to fool you into being merciful. Oh, yeah, and one more thing. It hates things that start with "cr" and end with "icket". Supposedly, there's something related to that somewhere in this castle. Did we find it?