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Chester (Japanese: テスラ Tesla) is a character of the day who appeared in Breaking Titles at the Chateau!. He is the younger brother of Nico. Together, they have a tendency of rapping their sentences.
While resting at a Pokémon Center with Nico, Chester overheard a conversation between Ash and his friends about the Battle Chateau. The brothers approached the group and invited them along, announcing that Chester was planning on making his own Battle Chateau debut, and following in the footsteps of Nico who already had the title of Baron.
Inside the Battle Chateau, the group was welcomed by Molly and Duke Turner. Chester watched his brother's victory over Farrell, which elevated Nico's rank to Viscount. Turner then announced that the next battle would be between Chester and Ash. Before the battle, Molly informed both Trainers the winner would gain the rank of Baron. Although Chester lost, Nico assured they would train together to win next time. Afterwards, he watched the battle between Viola and Grant. After that battle, Nico and Chester said their farewells to Ash and his friends, and hoped to challenge each other at the Chateau sometime.
- Chester and Nico's Japanese names derive from Nikola Tesla, a Serbian American inventor, electrical engineer, mechanical engineer, physicist, and futurist.