Viola

Viola is the Santalune City Gym Leader and an user of -type Pokémon. She is also a professional Pokémon photographer and the younger sister of Alexa.

Anime
Ash met Viola in Santalune City where he challenged her to Gym Battle. She used her Surskit and Vivillon against him. Even though she won the first round, she lost to him in the rematch thus giving Ash the Bug Badge. She also appeared in XY020: Breaking Titles at the Chateau! where she battled Grant but lost to him.

Trivia

 * Her name appears to be an anagram of "Voila!", which is usually said after completing an impressive task.
 * In her case, it would pertain to her photography.
 * According to the Gym Freaks TV show, the camera that she always has with her was a birthday gift from her sister Alexa.