Denryu Train Engineer

The Ampharos Train crew consists of one conductor, one engineer, and an Ampharos. They were characters of the day who appeared in Frozen on Their Tracks!.

They are in charge of a train, powered solely by an Ampharos, that runs from Snowpoint City to Lake Acuity. Their duties include conducting the train, communicating with the command center, informing passengers in case of an emergency, and inspecting the train. When the train runs low on power, the engineer commands Ampharos to use Thunderbolt to charge the train.

Partway through the episode, they saw a signal set at danger and stopped the train. Looker and the engineer went to go investigate it, while everyone else waited outside the train, eating the lunchboxes Looker gave them. Then, Team Rocket showed up with a suction machine, sucking in all of Ash, Dawn, and Brock's Pokémon, as well as Ampharos. Everyone except for Ash's Pikachu, Dawn's Piplup, Brock's Happiny, and Ampharos managed to escape when Team Rocket's balloon crashed. They were eventually reunited with their Trainers and continued on their way to Lake Acuity.

(Source: Bulbapedia)