The Lumiose Gym is a high-tech tower known as the Prism Tower. It is initially inaccessible when the player first reaches Lumiose City as it and much of the rest of the city have lost power due to a blackout. After the player has defeated Team Flare in the Kalos Power Plant, power will be fully restored to the city and the player will be able to challenge Prism Tower.
The Gym features groups of elevators guarded by the Gym's Trainers on several floors. On each floor before the sixth (where Clemont is), Bonnie will quiz the player about a Pokémon's silhouette as a multiple choice question, and the player must choose the elevator corresponding to the correct answer. The player must battle the Trainer guarding the elevator they have chosen before they can enter the elevator and know whether they have chosen correctly. If the player has chosen correctly, the elevator will ascend to the next floor, but if they have chosen wrongly, they will have to try another elevator.
The quiz choices and correct answers, indicated in bold, are as follows:
Any Trainers the player did not battle before moving to the next floor cannot be battled if the player returns to that floor. Any elevator the player used to ascend to a floor can be used to either return to the previous floor or directly to the first floor.
Spoiler warning: this article may contain major plot or ending details.
In Pokémon Legends: Z-A, Prism Tower is inaccessible due to renovation work being carried out by Quasartico Inc. The Lumiose City Gym is stated to be closed for the duration of the works.[1] Following the conclusion of the game's story, the Gym is assumed to be permanently closed due to the events that transpire, and the area is subsequently converted into Wild Zone 20.
In Clemont and Bonnie's backstory in Pokémon the Series, Clemont had created a robot called Clembot to cover for him when he found he had little free time due to his duties as a Gym Leader. However, his intended passcode wasn't recognized, so Clembot kicked him and Bonnie out of the Gym. After many failed attempts to reenter the Gym, they gave up. Over the next few weeks, it gained a bad reputation for shocking and violently ejecting challengers for either having less than four Badges or losing the Gym Battle.
Unaware of the Gym's reputation, since he was a newcomer to Kalos, Ash went to the Lumiose Gym first in Kalos, Where Dreams and Adventures Begin! after learning that the Santalune Gym was closed at the time. As Ash was about to challenge it, he was denied access as he had no other Badges from the Kalos region, resulting in him and Pikachu falling victim to Clembot's ejection policy. Fortunately, the two were saved by Clemont and Bonnie, who had seen them enter the Gym.
It later appeared in full in Clemont's Got a Secret!. Ash and Serena discovered that Clemont was the Gym Leader until Clembot took over. After discovering the negative impact Clembot was having on challenger attitudes towards the Gym, Ash and his friends go to the Gym to take it back from Clembot. In the end, the Gym was passed on to the newly-reprogrammed Clembot while Clemont is traveling.
In A Fork in the Road! A Parting of the Ways!, Clemont began his training for his battle with Ash, bringing his Pokémon from the Gym to his active party. The Gym was the site of the Gym battle in The Moment of Lumiose Truth!. After the Gym battle, Clemont once again left Clembot in charge while continuing to travel with his friends.
Lumiose Gym battlefield in Pokémon The Series: XY
In Kalos League Passion with a Certain Flare!, the Gym was closed down during the Lumiose Conference, allowing Xerosic and his underlings to easily take it over as the central base for Team Flare's plot to control Zygarde. In Down to the Fiery Finish!, while the Lumiose Conference closing ceremonies were underway, Team Flare begun the final phase of their plan by using their special weapon to subdue Zygarde CoreZ2 under their control, making it transform into its 50% Forme and attack Lumiose City with enormous roots, which also wrapped themselves around the tower.
The following episodes saw Ash being captured by Team Flare on top of Prism Tower, but he managed to break free and fight Lysandre together with Alain on top of the tower. Meanwhile, at the bottom of the tower, Clemont, Bonnie, Serena, Clembot, and Blaziken Mask encountered Mable and Bryony, who were guarding the entrance to the Gym. Serena subsequently left with Professor Sycamore and Mairin in order to rescue Mairin's Chespie from Lysandre Labs, while Bonnie and Blaziken Mask went after Squishy, whom Team Flare later managed to place under their control as well, leaving Clemont and Clembot together to battle the Team Flare Scientists. After eventually defeating and subduing the two Scientists, the duo entered the Gym in order to retake it. In The Right Hero for the Right Job!, they managed to enter the Gym, where Clemont encountered Xerosic. The two men of science started to battle while Clembot hacked into the machine controlling the two Zygarde. Clemont finally managed to defeat Xerosic's Pokémon, after which Xerosic was ejected out of the Gym by one of Clembot's trap doors. Unfortunately, when Clemont then prepared to shut down the control machine, Clembot revealed that the forced shutdown would also cause critical damage to its main memory, destroying it in the process. Clembot assured Clemont that this sacrifice needed to be done in order to stop the ongoing crisis and save the world. Reluctantly, Clemont agreed to this, sacrificing Clembot in order to destroy Team Flare's control machine.
As Clemont was retaking the Gym from the inside, Ash and Alain's battle with Lysandre was briefly interrupted by Malva, who revealed that she was opposing Lysandre's plan of destroying the world. In Rocking Kalos Defenses!, Ash and Alain finally managed to defeat Lysandre, but despite this and losing the control of both Zygarde, his confidence didn't falter. He then, much to everyone's shock, threw himself off of the tower, seemingly committing suicide. Ash, Alain, Clemont, and Malva subsequently left the Prism Tower in order to help stop Lysandre's secret weapon: the Giant Rock.
In Battling with a Clean Slate!, after the Team Flare crisis had ended and the Lumiose Gym and Clembot were being repaired, a Trainer named Alvin showed up at the Gym. He had lost a Gym battle against Clembot in the past, and now wanted to have a rematch with the robot. The next day, when both the battlefield and Clembot were ready to be used again, Alvin was given the rematch he had been hoping for. As Clembot had forgotten everything it had previously known, Clemont had to give it some basic strategic advises during the battle. The Gym battle eventually ended in Alvin's victory, earning him a long-awaited Voltage Badge. Later that night, the people of Lumiose City gathered around the Prism Tower to celebrate the tower's official reopening and relighting.
The Lumiose Gym reappeared in The Future is Now, Thanks to Strategy!, where it was visited by Ash and Goh while the former was preparing for his World Coronation Series battle against Drasna. When Ash's Sirfetch'd started to learn Meteor Assault, Clemont used one of his inventions to help in the move being mastered. Once Sirfetch'd had perfected the move with the inadvertent help of Dracovish, Clemont suggested a Double Battle to test the new move in action, which Ash accepted. During the battle, Dracovish ended up learning Dragon Rush. The match ended in Ash's victory, and he decided to use Sirfetch'd and Dracovish in his battle the next day.
Heliolisk was left in Clembot's possession when Clemont was exiled from the Gym. Later, Clemont allowed Clembot to use Heliolisk in Gym Battles. In The Moment of Lumiose Truth! Clemont used it for his Gym battle against Ash. It dealt major damage to Goodra but lost against Hawlucha.
Magnemite was left in Clembot's possession when Clemont was exiled from the Gym and was ordered to patrol to the Gym and keep out intruders. Later, Clemont allowed Clembot to use Magnemite in Gym battles.
Magneton was left in Clembot's possession when Clemont was exiled from the Gym and was ordered to patrol to the Gym and keep out intruders. Later, Clemont allowed Clembot to use Magneton in Gym battles.
The Lumiose Gym and the Prism Tower that houses it both debuted in Pangoro Poses a Problem. The Gym is powered by many Electric-type Pokémon due to the blackout happening in Lumiose City. One of the Pokémon producing electricity for the tower left the Gym to join X and his group.
Trivia
This Gym is tied with the Mossdeep Gym in Pokémon Emerald for the highest amount of common Trainers in a Gym, with both having 12. However, in this Gym, the player only needs to defeat four of them in order to get to the Gym Leader.
Both are the fifth Gyms of their respective region, and both Gyms are inaccessible the first time the player enters their city (though this is not true for the Hearthome Gym in Pokémon Platinum).
Both Gyms feature four sets of multiple-choice questions, and require the player to fight a Trainer if they answer the question incorrectly. However, the Lumiose Gym also requires the player to fight a Trainer even if the question is answered correctly.
Most of the underlings in both Gyms consist of young children and Ace Trainers.
