Chikuwa was the tour guide during Ash and his classmates' two-day trip through Malie City. In SM117, he first escorted them to the local Pokémon Center and had them change into Malie-style clothing before they toured Malie Garden. He pointed out some of the major landmarks before leaving them to explore the garden by themselves.
In SM118, Chikuwa took the group to the Kantonian Gym. He and his fellow Kantonian Gym Trainers were shocked to learn that Ash was actually from the Kanto region. He explained the way the Kantonian Gym operates to everyone before allowing them to enter. Only Ash, Kiawe, and Lana reached Chikuwa's task, an obstacle course held on the fourth floor of the Gym. Ash and Kiawe advanced to the fifth and final floor, while Lana was unable to complete the obstacle course after Meltan's taste for metal led to the course's destruction. Chikuwa later refereed Kiawe's, and then Ash's battles against Ryuki.
(Source: Bulbapedia)
