In the anime
Mr. Evans is the town's glazier and manufactures windows at his factory. He was even shown to make stained-glass windows, and was in the process of installing a circular arrangement at the local Pokémon Center. However, his business' reputation was damaged by his son, Zachary, and his Yanma.
A few months prior, he and his son had finished making a glass delivery to another town when they stumbled upon the injured Yanma and rescued it from a rainstorm. Despite Zachary's attempt to control his Pokémon's beating wings, it continued to break the townspeople's windows. After the town baker, Mr. Strussel, who claimed his windows were broken at least three times, demanded that Yanma be released, Mr. Evans reluctantly told his son to get rid of it despite knowing how much he cared for it and hated making him do so. Reluctantly, Zachary released it.
Despite his doubts, he encouraged Zachary to battle Team Rocket with Yanma. After Zachary saved the town from Team Rocket, Mr. Evans and the rest of the town recognized that Zachary had the potential to train Yanma, and they allowed him to keep it.
In the manga