Evan

Evan is a Pokemon trainer Daryon's group encounters in Pewter City. His starter Pokemon is a Torchic.

History
Evan is first seen during a battle with Brock. His Sandshrew had already lost, and Torchic is defeated shortly after. When meeting Daryon and his group for the first time, Evan is quick to joke around, jokingly accusing Daryon of distracting him and as a result causing him to lose against Brock.

During the fight against Team Rocket outside of the Pewter City gym, Evan immediately joins Daryon and Cameron in helping Brock. After witnessing Daryon's Pikachu perform a striking Thunder Shock combo against a horde of Zubat, Evan is unquestionably impressed.

The next time the group encounters Evan is in Cerulean City, where, with Ero's help, he is able to capture a Squirtle that has been following him for a while.

He is with Cameron when Mewtwo collapses the Cerulean Cave. He is also present during the gym battles with Misty.

Torchic.
Torchic is Evan's starter Pokemon, and assisted Evan in defeating a group of Team Rocket grunts in Pewter City.

Sandshrew.
Evan's Sandshrew is only seen once, where it was defeated by Brock's Geodude.

Squirtle.
Evan catches his Squirtle in Cerulean City, with the help of Ero. It is very shy but has a clear interest in Evan, as it has been following him all the way from Pewter City to the time it was caught.

Trivia

 * Evan appears to be from Hoenn, based on his clothing choices and his starter Pokemon, a Torchic.