Ash's Quilava

This Quilava is a -type Pokémon Ash caught in Johto that evolved from Cyndaquil shortly prior to the Lily of the Valley Conference.

Johto
As a Cyndaquil, similar to Ash's Charizard, Infernape, and Pignite, Quilava was forced to deal with an abusive trainer before Ash caught it, although unlike Charizard, Infernape, and Pignite it did not actually belong to that trainer.

At first, Cyndaquil had difficulty using its Fire type moves which saw it lose to a Steel-type Pokémon, Skarmory during JE036: Hot Matches!.

As such, it embarked on a training regime with Ash and it also finally gained the ability to ignite the flames on its back at will with the training also raising Cyndaquil's attack and speed.

Cyndaquil also beat Skarmory in a re-match. It also eventually mastered Flamethrower and was capable of using it with such power that Jasmine's Steelix was roasted within its own Sandstorm.

Cyndaquil was used frequently in the Johto region and was left at Professor Oak's lab when Ash went to Hoenn.

Sinnoh
While training for the Sinnoh League, Ash Ketchum brought Cyndaquil with many of his other Pokémon. However, Team Rocket tried to cause problems and Cyndaquil evolved into Quilava.

Quilava learned Eruption and was revealed to have learned Aerial Ace.

Voice actors and actress

 * Yūji Ueda (Japanese)
 * Kayzie Rogers (English as a Cyndaquil)
 * Bill Rogers (English as a Quilava)

Trivia

 * It took Quilava the longest of all of Ash's Pokémon to evolve after spending 507 episodes as a Cyndaquil.
 * So far, Quilava is the only one of Ash's -types that did not evolve in its introduction series.
 * Quilava, like Pignite, has not evolved into its final form.
 * Quilava was the only -type starter Pokémon that was not abandoned by its original trainer.
 * Quilava is Ash's first Pokémon that is not a flying type to learn the move Aerial Ace.