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Tierno (Japanese: ティエルノ Tierno) is a recurring character in the manga series Pokémon Adventures.
Tierno is a young man that is childhood friends with X, Y, Shauna, and Trevor.
Tierno is aiming to become a dancer and learns the skill at a dancing school in his hometown. His dancing skills also make him skilled in using Roller Skates, which impressed multiple Roller Skaters on Route 5, much to Tierno's embarrassment.
Tierno debuted in An X-cuse to Come Out and Play. He was first seen watching one of Y's failed attempts to get X to leave his house and come outside. Later, the Legendary Pokémon Xerneas and Yveltal appeared in Vaniville Town and began fighting, causing mass panic and destruction. Using her Rhyhorn racing skills, Y managed to get Tierno, Trevor, and Shauna to safety. Once X was retrieved, Y decided that with their home destroyed, the best option was to leave town. Tierno and his friends then set off on a journey, together for the first time in years.
In Inn-teresting Developments, the group arrived in Aquacorde Town. Tierno, Trevor, Y, and Shauna stayed at an inn for the night while X slept in the tent on Y's Rhyhorn's back. The inn was a trap designed to keep Tierno and the others locked inside while the Team Flare scientists Aliana and Mable attempted to take X's Li'l Kanga while he wasn't looking. Y broke free and informed X of the situation, but when he tried to Mega Evolve Li'l Kanga, it failed. Having no other options, X and Y used the Chespin and Froakie Trevor got from Professor Sycamore to defeat the scientists.
In Kangaskhan...Kangascan't, the group stocked up on supplies in Santalune City. There, they met Viola, who allowed everyone to investigate photos she took of the Vaniville incident at the Santalune Gym. Despite Y telling everyone to be wary of adults they didn't know, she and the others cautiously accepted Viola's offer. Frustrated and confused by this behavior, Shauna refused to go and ran off. That night, another Team Flare scientist named Celosia appeared. Using a Honedge, Celosia took control of Shauna's mind and used her to steal Kanga's Kangaskhanite. X teamed up with Korrina, another Gym Leader and fellow user of Mega Evolution, to defeat Celosia and retrieve the Mega Stone. Later, Tierno received a pair of Roller Skates from Korrina as a gift. After learning that X obtained his Mega Ring without the proper succession ceremony, Korrina refused to acknowledge X as a true Mega Evolution Successor and angrily left without telling him more about it.
In What Does Charmander Do When It Dozes?, the group came across a sleeping Charmander and belonging to Sycamore and took it with them. Shortly after they arrived in Lumiose City, Charmander was taken by Sina and Dexio, who mistook the Vaniville children for thieves. Using his Roller Skates, Tierno retrieved Charmander and cleared up the misunderstanding. Once everyone met Sycamore, X stayed behind while Tierno and the others Lysandre Café to have Trevor's broken Holo Caster repaired. The group was introduced to Lysandre, an inventor and owner of the café. Upon seeing Lysandre's silhouette in a photo of the Vaniville incident, Trevor became suspicious of the man. Noticing Trevor's strange behavior, Lysandre asked to see the photo, even sending out his Pokémon to surround the group when Trevor refused. Tierno and the others were rescued by Diantha, who used her Mega Gardevoir to convince Lysandre to back off. After saying farewell to Diantha, Tierno and the others met back up with X and Sycamore.
Tierno using his Roller Skates
In Pangoro Poses a Problem, Sycamore went inside the Prism Tower to have an interview. While the group waited outside, X sensed danger and led everyone inside to investigate. There, they found Alexa under attack by the Lumiose Press editor-in-chief. X battled and defeated the editor-in-chief's Pangoro, rescuing Alexa's Heli in the process. Fearing Lumiose wasn't safe for them either, Tierno and the others left town while Alexa went to stay with Viola. As they left, an Electrike that helped power the Prism Tower started following X.
In Fast-Thinking Froakie, Y's clothes were taken by the Electrike that had been following the group. Electrike was defeated by Y's Croaky, but it only wanted Y to retrieve a Manectite that was stuck on a tree. Y initially refused, but was convinced to help when Electrike evolved into a Manectric while sitting on her head. The group was approached by Clemont, the Lumiose City Gym Leader, who offered to help find the stone with one of his inventions. Before Clemont could grab the stone, a Team Flare Grunt stole it and ran away. While X and Trevor chased the Grunt and Y helped remove a tree that fell on top of Clemont, Tierno and Shauna fought the Grunt's four Espurr. They were later helped by Cassius, who easily defeated the Espurr.
In Dancing Vivillon, Cassius used a helicopter to transport Tierno and the others to Cyllage City, where Clemont had seen Y's mother Grace being taken away by Team Flare members. The vehicle was attacked by a group of students from Y's Sky Trainer school. Together, Y and X defeated the Sky Trainers as well as Celosia's Aegislash, who was manipulating them in secret. The damage dealt to the helicopter caused a propeller blade to snap off and hit Y, sending her crashing down to Route 9. Cassius made an emergency landing in Cyllage, but the damage done to the cycling area angered the Cyllage City Gym Leader, Grant. While Cassius dealt with Grant, Tierno and the others left him behind to search for Y. Tierno and Shauna suggested that after Y was found, they should find Team Flare's base and confront the villains there.
In Gathering Klefki, Tierno and the others found Y on Route 8. Y informed everyone that Team Flare planned to use mind-controlled Vanville Town residents as forced labor to move the dormant tree form of Xerneas back to their hideout and have it power a device known as the ultimate weapon. The group decided to let Team Flare take the tree so they could follow the villains back to their hideout. Later, Celosia arrived to oversee the operation to move Xerneas. Noticing her mother among the laborers, Y leapt in to save her, only for her Sky Suit to fail due to the damages it sustained earlier. X attempted to have Li'l Kanga and Élec Mega Evolve at the same time, but it failed, giving Essentia the chance to capture everyone with her Trevenant. Celosia tried to kill X, but was stopped by the timely arrival of Korrina, Diantha, and Gurkinn.
In Changing Gengar, Korrina and Diantha faced Team Flare while Gurkinn freed Tierno and the others. With his newly-obtained Garma he received from Gurkinn, X defeated Essentia, forcing her to run away. Tierno, X, and Trevor went ahead to help Korrina while Y and Shauna helped Diantha. Tierno's group found Korrina, only to discover that Celosia managed to defeat her. Korrina succeeded in freeing the townspeople from Celosia's control, but couldn't prevent Xerneas from being taken and had her Key Stone stolen as well.
In Quilladin Stands, the rescued townspeople and Korrina were taken to a hospital in Laverre City. Tierno, Y, and Shauna trained together with Gurkinn's assistance. Later, Trevor informed everyone that X disappeared and presented them a pair of glasses he left behind. When the glasses broacasted an image of Geosenge Town, everyone realized the glasses belonged to Clemont and concluded that X learned the location of the Team Flare Secret HQ and went there by himself. Tierno, Y, Trevor, Shauna, and the Kalos Gym Leaders followed X to Geosenge Town, but as soon as they arrived, everyone witnessed the ultimate weapon emerging from underground like a flower bud. To prevent the weapon from blooming, Y and the Gym Leaders tried keeping the petals in place by force.
In Flabébé Blooms, Tierno, Trevor, and Shauna avoided Bryony's attacks and made it inside the Secret HQ. There, they reunited with Clemont and freed AZ, a giant man that was held prisoner. Tierno and the others found X, who managed to revive Xerneas, but lost to Lysandre, the leader of Team Flare. Tierno, Trevor, and Shauna tried removing the ultimate weapon's key, but were unable to pull it out in time before it fired. To Lysandre's frustration, the combined efforts of X, his friends, and the Gym Leaders successfully weakened the ultimate weapon, preventing it from taking any innocent lives. AZ stayed behind to allow Xerneas to take Trevor and the others back to the surface. Once everyone reunited with Y, Xerneas joined her team and was nicknamed Xerxer. Y told Xerxer to destroy the ultimate weapon, but they were interrupted by Malva, who managed to capture Yveltal. Due to Xerneas and Yveltal being evenly matched, Xerosic announced that Lysandre ordered a ceasefire. Xerxer confirmed this and retreated, taking Tierno and the others with it.
In Pinsir Glares, the group rested at the Lost Hotel. Ramos revealed that Team Flare blamed the destruction caused by the ultimate weapon on the Vaniville children and the Gym Leaders. He advised Tierno and the others to keep hiding from the public while the Gym Leaders helped rebuild the damaged areas. Y received a Key Stone and Mega Ring from Gurkinn, officially making her a Mega Evolution Successor. Later, on Route 15, X and Y looked for Pokémon capable of Mega Evolution to catch. During X's search for a Pinsir, the group met Blue, another Trainer from the Kanto region. Trevor received a call from Sycamore, who asked everyone to meet him in Anistar City so he could aid them on their journey.
In Hawlucha Attack, Tierno and the others arrived in Anistar, where they found Sycamore under attack by a group of Hawlucha. Once taken to safety, Sycamore revealed that ultimate weapon's blast affected the Key Stones, giving them the ability to track Mega Stones, but only from 8 PM to 9 PM. When X noted the Hawlucha were under a Trainer's command, Tierno and Shauna decided to search for the Mega Stones while X and Y stayed behind to protect the professor.
Tierno with his dance group
In Pinsir Changes, Tierno and Shauna searched for Mega Stones. On Route 19, Tierno and Shauna came across a large group of Pokémon that were drained of their life energy. Though horrified at the sight, they continued the mission and moved an unconscious Aggron to get the stone underneath it. Tierno and Shauna returned to Anistar, where they returned the Mega Rings and handed over the Pinsirite and Absolite needed to Mega Evolve Rute and Solsol into Mega Pinsir and Mega Absol. Essentia retaliated by sending out Xerxer, who she took control of with her Expansion Suit's Poké Ball Jack function. X and Y combined their attacks to damage Essentia's suit and free Xerxer from her control. The battle was interrupted by the arrival of Zygarde, who had come to suppress Xerxer's power. Essentia chose to shift her priorities by capturing Zygarde and had her Trevenant bind it. Zygarde tried powering itself up by absorbing the power of nature, but this left it completely defenseless, allowing Essentia to easily catch it and escape. Afterward, Sycamore received a call from Sina and Dexio, who found out that Team Flare went into hiding in the Pokémon Village.
In Malamar Traps, Tierno, his friends, Blue, and Diantha set off to confront Team Flare at the Pokémon Village. Along the way, the group was attacked by Xerosic, who had his Malamar put everyone to sleep with Hypnosis. By evolving into a Greninja, Croaky worked with X to battle Xerosic. Croaky was eventually defeated, but successfully woke the others up. X and Blue stayed behind to keep Xerosic busy while Tierno and the others went ahead. The remaining Team Flare scientists intercepted Tierno's group to separate them for one-on-one battles. Tierno's opponent was Mable.
In Xerneas Gives, Tierno was hit by Mable's Houndoom's Inferno, injuring his right leg and melting one of his Roller Skates. Tierno eventually came out on top when his Corphish evolved into a Crawdaunt, giving it the strength to defeat Houndoom. After meeting up with Trevor and Shauna, Aliana was taken down as well. Tierno and the others went to meet X's group at the village, only to find Xerxer in battle with Yveltal. Xerxer informed everyone that it and Yveltal were returning to their dormant tree and cocoon forms, ensuring that Zygarde would have no reason to remain in Kalos. This allowed X to launch one final attack and completely separate Zygarde into its Cells, leading to Lysandre's defeat. With Team Flare's schemes foiled, Tierno and his friends said farewell to their allies and returned to Lumiose City, where the townsfolk went about their daily lives as if nothing had happened.
In Epilogue, AZ approached the Vaniville children and revealed he created the ultimate weapon. Noting how the people shunned Tierno and his friends despite their hard work, AZ suggested Team Flare's ambitions weren't wrong and went to go activate the ultimate weapon again. Everyone tried stopping AZ, but he retaliated with his Golurk. When one of Golurk's attacks was about to hit Y, AZ stepped in and took the attack himself. AZ survived, but the ultimate weapon's key was destroyed. The battle was merely an act to prevent Tierno and the others from heading down the path Lysandre took. With his mind at ease, AZ thanked the Vaniville children, only to be shocked at the return of the Floette that left him 3,000 years ago. After saying goodbye to AZ, the group was greeted by Sycamore, the Gym Leaders, Alexa, Bonnie, and Yvette. Sycamore proposed a party and parade as a celebration for the Vaniville Children's efforts, but they refused. Tierno and his friends returned home, where Y reunited with her mother.
Three months later, Tierno was revealed to have started a dance group that performed in the Lumiose City alleyways. The other dancers used to be members of the Lumiose Gang.
Taken care of