Ash and his friends first arrived at Shalour City in Origins of Mega Evolution! to challenge the Shalour Gym. There, they met up with Korrina again. They discovered that the Gym was inside the Tower of Mastery, which was located on Mega Evolution Island, which is only accessible during low tide. While waiting to access the island, Ash attempted to master Tierno's rhythmic battle style, but failed to.
During low tide, Ash and the group eagerly entered the Tower of Mastery, where Gurkinn gave them a history lesson in Mega Evolution and mentioned his "Scroll of Secrets", which got stolen by Team Rocket. After retrieving the scroll, Ash and Korrina prepared to start their Gym battle the next day. In Showdown at the Shalour Gym!, Ash defeated Korrina with his unique battling style and earned the Rumble Badge. Afterwards, the group left the city.
Ash and Goh traveled to Shalour City in A Festival Reunion!. While Goh caught himself some Kalos Pokémon, Ash competed in a Battle Festival Challenge for the World Coronation Series. Between battles, Ash met back up with Korrina. Both of them were high enough on the rankings to have one single victory to raise them to the Great Class. They decided to battle each other to determine who was going to promote to the Great Class. The battle was tough, but eventually, Ash emerged victorious.
Shalour City's real-life counterpart is the city of Saint-Malo. At low tide, it is possible to cross the sea on foot from Saint-Malo to Grand Bé Island, where ancient ruins still stand. It might also have been inspired by Mont-Saint-Michel, which is also accessible at low tide and located in the same general area, although belonging to another region of France. Shalour City's name may be derived from Chaleur Bay, located in the Francophone region of Canada.
シャラシティ Shara City
From 娑羅香 shara-kō, incense produced from the resin of shala tree that is considered to be sacred in Hindu and Buddhist tradition
From shala and possibly tour (French for tower) or Chaleur
From Yantra (a geometric diagram used as a tool for meditation in Indian religions)