Character: Magmarashi (Isaki)

Quilava is the evolution of Cyndaquil. Quilava have long, thin bodies with small forepaws and slightly longer hindpaws, similar to real-life weasels. Their tan fur is slightly darker than Cyndaquil's, while the blue streak has been lowered to cover their eyes. As per the family line, Quilava sport short, coarse fireproof fur and have special vents on their heads and lower backs. Though they do not have a tail, the lower vents are positioned as to give the illusion of one.

Quilava are noted in the Pokédex to turn their backs toward their opponents in battle as a sign that they are about to use their flame-based abilities in battle, or to intimidate foes by demonstrating their power. Quilava are noted for their speed, and can nimbly evade attacks while scorching their enemies. They can also create gusts of superheated air, albeit to the same effect.

Dawn's Quilava evolved from her Cyndaquil while in the forest near Professor Rowan's laboratory. While chasing after the escaped Pokémon from Professor Rowan's laboratory, a ton of Ariados used their String Shot to capture everyone and they could not break free. After Dawn's Quilava had finished evolving, it was able to break free from the String Shot and was able to fight off the Ariados with Eruption which it had just learned.

Clark's Quilava participated in the double battle rounds of the Ever Grande Conference.

Macey's Quilava battled against Ash during the preliminary round of the Johto Silver Conference.

Ash's Cyndaquil was recalled from Oak's laboratory for the Sinnoh League but Team Rocket stole its Poké ball during the transfer. Pikachu shocked Team Rocket to get the Poké balls back but it sent them flying into the air. Ash recovered them but they were empty. Cyndaquil was the final Pokémon he located after recovering the Poké balls but it was cornered by Team Rocket's mecha. During the battle with the mecha as it was about to be captured, it evolved into Quilava and was able to destroy the mecha.