Gleerok

The Gleerok (グリロック, Gurirokku) is the guardian of the Cave of Flames high atop Mount Crenel in The Minish Cap. Defeating it involves firing the Cane of Pacci at its back, and then climbing onto its back and slashing with your sword while it is rendered unconscious. Gleerok's main form of attack is to spew fire on any surrounding prey or threats. If all else fails, it will submerge itself in its lava pool and cause major disruptions within its abode, including an increase in lava flow and tectonic disruptions that cause chunks of rock to fall from the ceiling. Gleerok is most likely an evolutionary offshoot of the Gleeok, adapted to harsh lava-filled environs. Along with this evolution/adaptation, it seems to have lost the ability to sprout multiple heads. This creature bears an uncanny resemblance to the Pokémon Lugia. In the manga, Gleerok was, prior to the battle, cursed by Vaati. Once defeated, Gleerok turns back to its true form.