Who was charla's trainer in the anime?

Question

I am writing a Pokemon fanfic and my main character is charla's trainer's son. I will also take character and shipping request.

Answer 1

Liza

Liza made her debut appearance in Charizard's Burning Ambitions. She knew of a Trainer's win at the Violet Gym with a Charizard, and immediately deduced that that Trainer was Ash Ketchum, as she can identify Charizard Trainers by the lingering scent of their Charizard partner. She invited Ash and his friends to come with her into the valley, encouraging Ash to ride his Charizard as transport, somewhat questioning why—as a Charizard Trainer—he had never flown upon his (even though when Ash originally got Charizard to obey him in Charizard Chills, he also flew on it). She also questioned the strength of Ash's Charizard, indicating only 'weak' Charizard display their power through Charizard's typical stream of fire, and that it needed some serious training. Charizard wanted to train at the valley seeing the other powerful Charizard there, but Liza initially refused after it lost to her Charizard, Charla. But after seeing its determination to train there, she agreed.

A picture of Liza and Charla in the anime

Bulbapedia Liza

Answer 2

Liza.

(Liza and Charla as they appeared in the original series.)

>Liza is the caretaker of the Charicific Valley, which was made specifically as a natural paradise for wild Charizard.

>Charla belongs to Liza, who maintains the Valley. When Ash and his friends were going through the Valley, they had the opportunity to meet Charla. Charla is Liza's only Pokémon, and her greatest partner, seeing as she travels with her to places outside the valley. Charla was also the only non-wild Pokémon in the valley when Ash and his friends met her.

Liza and Charla appeared in the Best Wishes series in a flashback:

Source: Liza | Charla