Clemont was said to be a genius when it came to Electric-type Pokémon. It was revealed in A Campus Reunion! that prior to the XY series, Clemont used to study at an academy specializing in Electric-type Pokémon in his youth, having been sent there by his father Meyer. His old teacher Éclairisse described him as a brilliant student, also indicated by how he was still a child when he graduated, when most other graduates were young adults or adults. Despite this, Clemont had trouble with the research for his graduation assignment. During a recreational stroll, he found an exhausted Shinx. Without hesitation, he immediately brought him to a Pokémon Center where he was quickly healed. Nurse Joy told him Electric-type Pokémon were often brought in, having lost a lot of energy. She figured they wouldn't suffer from electricity loss if there was a place where they could freely absorb energy. This gave Clemont the idea to build an invention he called the "Clemontic Shower". The idea was a success, being highly acclaimed by teachers, and caused Clemont to graduate.
Returning home, Clemont eventually became the Gym Leader of Lumiose Gym in order to understand Electric-type Pokémon even better. However, he found that being a Gym Leader ate into his spare time and gave him little time to spend with his beloved inventions, so he created Clembot, a "Gym Leader robot", to stand in for him when he was busy. He programmed it to be tough on challengers and to reject challengers with less than four badges. This proved to be a mistake, as Clembot turned out to be violent and would shock Trainers whose challenge it rejected (or, as it later turned out, who lost to it) and eject them from the Gym. Clemont himself was deemed to be a rejected challenger as he had no badges. Clemont attempted to set Clembot to "Master Recognition mode" so he could reprogram it, but it hadn't registered the pass-code he expected it to, so he was ousted from the Gym and cut off from his Pokémon. He eventually gave up trying to reenter, as Clembot refused to allow him past the entrance.
In Kalos, Where Dreams and Adventures Begin!, Clemont was first seen some time after his ejection from the Gym with his sister Bonnie in Lumiose City. Both were standing outside the Prism Tower when they watched Ash go inside. After Clembot ejected Ash from the building for not having any Badges, Clemont saved Ash with his Clemontic Gear while Bonnie saved Ash's Pikachu. After introducing himself, Ash challenged Clemont to a battle, which he accepted. Clemont battled Ash and his Pikachu with his Bunnelby. Despite admitting that he only just caught Bunnelby, Clemont proved to be an effective battler and managed to counter many of Ash's attacks.
The battle was interrupted by Team Rocket, who were aiming at stealing Pikachu and Bunnelby. Together with Ash and a Froakie that saved Pikachu from an attack, the trio were sent blasting off. However, Froakie had gotten injured in the battle and collapsed, so Clemont suggested they hurry to Professor Sycamore's lab. Clemont lagged behind as he was forced to carry everyone's bags.
In Lumiose City Pursuit!, Clemont helped Ash stop a rampaging Garchomp by using his Clemontic Gear's Aipom Arm to break into Prism Tower. He was unable to go any further when a part of the tower collapsed in front of him and Bonnie, but Ash managed to go on and save the day.
In A Battle of Aerial Mobility!, Clemont and Bonnie officially decided to accompany Ash on his journey through Kalos. Throughout the episode, Clemont expressed his admiration of Ash and respect for him as a Trainer. Later in the episode, Clemont demonstrated another one of his inventions, a phonograph that made a sound at high frequencies to attract bird Pokémon. Unfortunately, the machine only attracted Beedrill before completely exploding. Though it caused the group trouble, Ash said that the machine was an incredible invention which made Clemont delighted and proud.
In A Shockingly Cheeky Friendship!, he and the others encountered the Dedenne they had met before. Clemont used Bunnelby to track Dedenne after it ran off so that he could keep it for Bonnie, but Dedenne had gotten lost with Pikachu. After Dedenne and Pikachu had escaped from Team Rocket and met up with the others, Dedenne fell over from exhaustion. Using one of his Clemontic Gears, Clemont recharged Dedenne despite the machine blowing up in everyone's faces immediately after. When Team Rocket attacked the group, Clemont used Dedenne to send them blasting off with Pikachu's assistance. He then caught Dedenne and gave it to Bonnie so that she could keep it in her satchel.
In A Blustery Santalune Gym Battle!, the group arrived in Santalune City, where they met the Santalune Gym leader, Viola. Clemont and Bonnie also met her sister, Alexa, who Ash already knew well from his travels in the Decolore Islands. During their tour of the Gym, Bonnie asked Viola if she would marry Clemont, embarrassing him and leading him to drag her away with his Aipom Arm. He, Bonnie and Alexa watched the battle with Viola, cheering for Ash. Just after Ash sent Fletchling out, Serena, a girl who knew Ash from her childhood, entered the Gym and joined the audience. After Ash lost the Gym Battle, they were introduced to her properly. The three later watched Ash train with Alexa.
Later on, Clemont helped Ash train with another Clemontic Gear, a cannon that fired artificial Sticky Webs, as Ash had lost the battle against Viola as a direct result of Fletchling getting stuck to a Sticky Web. Unfortunately, when he put it onto its maximum setting, it malfunctioned, got blocked by its own ammo and exploded, though this mishap did inspire Ash to use Electro Ball to prevent Pikachu from falling asleep from Vivillon's Sleep Powder. After the training was finished, he realized that Bonnie was about to fall asleep and decided to put her to bed. The next day, he, Bonnie, Serena and Alexa cheered for Ash during his rematch and victory against Viola.
In Clemont's Got a Secret!, Clemont's father, not realizing that Ash and Serena were unaware of Clemont's status as a Gym Leader, revealed this fact to Ash and Serena. Seeing that there was no point in hiding it any longer, Clemont told Ash and Serena about how he was ousted from his position by Clembot. After seeing the damage the "strange robot" was causing to the Gym and how it was driving away potential challengers, Clemont decided to challenge the robot to a battle for ownership of the gym, although he had no idea what the pass-code was. He was forced to contend with his Magnemite and Magneton, which had been ordered to patrol the Gym by Clembot, but he eventually got to the battlefield, confronted Clembot, and started its Master Recognition mode. Although Clemont finally realized what the pass-code was, he was forced to battle Heliolisk, his own Pokémon that was under Clembot's control. Clemont battled with Bunnelby and was ultimately successful in defeating Clembot, thus gaining back the title of Gym Leader. Clemont then decided to completely reprogram Clembot and left ownership of the gym to it so he could continue traveling with Ash. That night, Ash and Clemont agreed to have a Gym Battle after the former got four badges.
In Mega-Mega Meowth Madness!, Clemont befriended a Chespin from Professor Sycamore's laboratory, later rescuing it during an attack by Team Rocket in their newest mecha. Together, they deduced a way to deactivate the mecha, but when that proved unsuccessful, Clemont commanded Chespin in battle against the mecha alongside Pikachu, but their efforts were met in vain. The mecha was then defeated by a Blaziken belonging to Blaziken Mask. The following evening, Clemont decided to capture Chespin when it expressed a desire to travel along with him and the rest of the group.
In Awakening the Sleeping Giant!, the group travelled to Parfum Palace to retrieve a Poké Flute that Princess Allie had stolen from Lord Shabboneau. Clemont refereed a battle between Ash and Princess Allie for ownership of the flute, but when Allie refused to hand it over after she forfeited, he confronted the princess directly, scolding her behavior which he considered "unscientifically selfish". Unfortunately for him, Allie was touched by his scolding, and eventually agreed to hand over the Poké Flute in exchange for Clemont himself: Clemont's horror only intensifying when Bonnie (on Serena's suggestion) agreed to it. Although the rest of the group promised they would return for him, Clemont eventually made his own escape by planting a robot decoy, and eventually reunited with his friends and sister.
In Heroes - Friends and Faux Alike!, Team Rocket, after separating Clemont from the rest of the group, disguised themselves as scientists and requested his help with a machine they were having trouble with. Not realizing who the scientists actually were, Clemont built for them a Heliolisk-shaped machine that repelled Electric attacks as well as a device that transported capsules containing Pokémon. The next day, when Team Rocket lured the group into their trap, they used the Electric-type resistant machine to steal Pikachu and then the Pokémon transporter sent it away. Clemont, furious at Team Rocket for tricking him, used Serena's guidebook and Bunnelby's Dig to locate Team Rocket and Pikachu, whereupon he used a new and improved version of an earlier machine to repel Pumpkaboo's and Inkay's attacks. With Bunnelby's help, he easily defeated the trio and Pikachu sent them blasting off.
In A Campus Reunion!, the group arrived at the academy, where Clemont used to study in his youth and met Clemont's old teacher Éclairisse. Clemont told he invented an electric shower for Electric types called the "Clemontic Shower". Clemont revealed he came up with the idea after helping an exhausted Shinx, which became his best friend during his time at the academy. While they were shown around the academy, the alarm system activated meaning something was going on with the electrical systems under the academy. As the group helped investigating the place they encountered Team Rocket, who immediately fled. While chasing Team Rocket a wild Luxio appeared, which started to attack Ash and the rest. After convincing the Luxio they were not its enemies, the Luxio passed them and chased Team Rocket before sharing a glance with Clemont, causing both of them to realize they were each other's old friends. That evening Clemont told Ash, Serena and Bonnie how he had left Shinx on his graduation day, causing Luxio to be angry at him. At that moment the building lost power, with Éclairisse mentioning someone was draining electricity from the town's power source. Arriving at the power source the group found Luxio battling Team Rocket and while continuously getting attacked he didn't give in. As he was about to get hit by Pumpkaboo's Shadow Ball, Clemont protected Luxio by taking the attack, causing Luxio remember Clemont as his friend. Fighting together they managed to blast Team Rocket off. After the battle as Luxio was about to leave Clemont told him he was sorry about leaving him and that he wanted to travel with Luxio, telling him he would be waiting for him at the place they originally promised to meet. The next day Clemont was waiting, but Luxio still hadn't appeared. As Clemont was about to leave telling himself Luxio still hadn't forgiven him, Luxio appeared from a bush. Crying tears of joy Clemont threw a Poké Ball and caught Luxio, finally being able to be with his friend.
In The Future Is Now, Thanks to Determination!, the group arrived at the Kalos Power Plant, where Pikachu, Luxio, and Dedenne began acting strange, attacking in the group in a seemingly hypnotized state. After finding out that Team Rocket was responsible for the mind-control, Clemont and the group attempted to stop them. During this, Clemont watched as Ash attempted to communicate with Pikachu as he was being shocked by Thunderbolt. However, Luxio slammed Ash away before he could get through to Pikachu, prompting Clemont to step in and take a Thunder Fang. Clemont managed to temporarily disable Team Rocket's brainwashing device, which freed Luxio and the other Electric-types from Team Rocket. Immediately after, Luxio evolved into Luxray and learned Electric Terrain, destroying Team Rocket's machine and sending them blasting off. Later that day, Clemont decided to join some Kalos Power Plant Workers on a helicopter ride to Lumiose City, saying that he needed to go there to train, in order to give Ash the best Gym Battle that he possibly could. Agreeing with Clemont's decision, Ash, Serena, and Bonnie waved goodbye to him and Luxray, with Ash and Clemont promising each other to train hard for their match.
In The Moment of Lumiose Truth!, Clemont and Ash had their long-awaited Gym Battle, using his Bunnelby, Heliolisk and Luxray against Ash's Pikachu, Goodra and Hawlucha. The battle started with a move by move recreation of their first battle before Team Rocket's interruption until Clemont broke the pattern with a new move from Bunnelby through his solo training. However, despite this, Pikachu was able to beat Bunnelby after a hard fought battle. Clemont used his Heliolisk next, and due to carefully analyzing Ash's battle style, Clemont was able to use Ash's unpredictability in his own strategy giving him a great advantage by paralyzing Ash's Goodra and forcing Ash to switch to his Hawlucha. Heliolisk was defeated when Ash, using Clemont's skill of analyzing a battle discovered its weak spot and delivered a critical hit that knocked the Generator Pokémon out. Clemont's last Pokémon was Luxray, which immediately used Electric Terrain, landing next a boosted Wild Charge on Hawlucha, knocking out the Wrestling Pokémon with a single hit. Luxray faced off against Pikachu next, beating it with another super charged Wild Charge. After Ash sends out Goodra again, he tells it use Rain Dance and not only it disabled Electric Terrain, but it activated Goodra's Ability, Hydration, and was cured of the paralysis. When the battle continued, Luxray use attacks on Goodra, but the Dragon Pokémon use Bide to endure. After releasing the energy from Bide, Goodra was able to knock out the Gleam Eyes Pokémon, winning Ash the battle and the Voltage Badge. After thanking Ash for a great battle, Clemont rejoined him on his journey once more.
- In XY055 Bonnie, Clemont's Dedenne and Meowth narrate the preview for the next episode.
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