Chert

Chert is a Rock-type trainer and Gym Leader of Arched City in the Atora Region in Pokémon Sun & Moon Versions.

In the games
Chert is the seventh Gym Leader encountered in the games. He can be battled at his Gym in Arched City. He hands out the Topaz Badge to trainers who defeat him.

Pokémon
Hooper can be battled in Arched City.