Spoiler warning: this article may contain major plot or ending details.
Clavell first appears as the host of the introductory video at the start of the game, welcoming the player to the academy as well as the Paldea region as a whole. On the player's first day as a student, he arrives at their house in Cabo Poco to give them their first partner Pokémon. Clavell leads the player to the house of Nemona, a Champion-ranked Trainer and fellow student, where Clavell asks the player to select a Pokémon. Nemona then decides to take one of the Pokémon herself to start anew, and Clavell takes the last of the first partner Pokémon remaining. After the player and Nemona battle, Clavell remains at Nemona's home in Cabo Poco until the two arrive at the academy.
Pre-game
In his youth, Clavell studied at the same university as Cyrano, who later founded Blueberry Academy in Unova. Later on, Clavell worked primarily as a Pokémon researcher and was part of the research team of Professor SadaS/Professor TuroV, investigating Area Zero. Jacq, the current biology teacher of the academy, worked alongside Clavell as his subordinate and is frequently at the receiving end of Clavell's criticizing. A year and a half before the events of the game, Clavell was named the director of the academy by Geeta.
★ Starfall Street ★
During the ★ Starfall Street ★ storyline, he disguises himself as a student named Clive (Japanese: ネルケNelke) to support the player and learn the truth behind Team Star's reputation and actions.
Victory Road
Clavell appears as part of Iono's Gym Test, where he hides somewhere in three locations, the first location being the street connected to the Levincia Gym building, the second location being the street connected to the Levincia Pokémon Center, and the third location being the Levincia Gym's battle court. The player must use the street surveillance cameras to seek him. Iono refers to Clavell as Mister Walksabout (Japanese: ジェントルさんJentoru-san) throughout the Gym Test. Clavell explains that he owes the Pokémon League "for many a past favor", which is why he agreed to help Iono with her Gym Test. For the first two locations, the player will always have to battle Iono's Gym Trainers, even if they found Clavell on their first try or not.
Post-game
After the player's adventure in Area Zero, Clavell thanks them, Nemona, Arven, and Penny for their efforts in stopping the professor's time machine, despite having had to go into the area without permission to do so. After giving the player a Master Ball, Clavell explains that while their deeds in Area Zero must be kept secret, the player's attaining of Champion rank deserves to be celebrated, and he and Nemona begin organizing a tournament to test the player's strength as a Champion. Known as the Academy Ace Tournament, Clavell gives the tournament's opening speech. After the player wins the competition, Clavell decides for more competitions to be held, and may appear as a final opponent in further tournaments.
Pokémon
Clavell's team will always contain the final evolutionary form of the first partner Pokémon with a type advantage to the player's chosen first partner Pokémon. This is likely the first partner Pokémon that remained with him after the player and Nemona chose their own first partner Pokémon at the beginning of the game. The remainder of his team will be based on his first partner Pokémon. Clavell also sends out a Pawmi during the game's opening cutscene.
Upon the third unique interaction with Clavell in the League Club Room, he will trade a Pawmo to the player in exchange for almost any Pokémon excluding Shiny, Legendary, or Mythical Pokémon.
Clavell first appeared in HZ046. He was first seen with Geeta explaining the Terastal phenomenon and Naranja Academy's Terastal Training to Liko, Roy, and Dot. When Nemona joined them, Clavell asked her to show the new students around the academy. Later, when "Sandwich" and "Onigiri" arrived at the academy, Clavell noted they were not registered in the school's systems. He was then approached by "Agepan", who promised to resolve the issue for him.
In HZ050, Clavell found Sandwich and Onigiri spying on Liko's group in Levincia. Believing the duo were interested in the performance of their academy colleagues, Clavell offered to accompany them to the Levincia Gym, only to be left behind while he was distracted. Shortly afterward, Clavell traveled with Liko and Roy to watch Dot's Terastal battle against Iono. After the battle, Clavell instructed Liko, Roy, and Dot to return to the academy while also doing reports on any wild Pokémon they encounter on the way back.
In HZ055, Clavell met the students taking on the Terastal Training course as they returned to the academy and announced the Elite Four Tag Battle, a friendly set of Tag Battles where students would get to team up with Gym Leaders against members of the PaldeaElite Four while waiting for their next assignment. He was later seen observing the battles alongside Geeta.
In HZ057, alongside Geeta, Clavell was introduced to Terapagos during a meeting with Friede, Liko, Roy, and Dot. After telling them what they knew about the Pokémon, Geeta talked about Area Zero, and together with Clavell recommended that the group seek help from Raifort to find out more about Terapagos and Laqua.
Character
According to Clavell, he has the habit of personally monitoring his students' performance, and seeing how well they do.
Clavell also has a habit of dwelling on random topics at important moments. He also tends to get into lengthy conversations without realizing it.
Clavell debuted in PASV01. He was first seen at Uva Academy's courtyard, hosting the opening ceremony for the Treasure Hunt. The presentation was interrupted by a student named Violet, who agreed to accept punishment if he was defeated in a race. Dendra accepted the challenge and competed against Violet alongside two other teachers. Although Dendra emerged the victor, Violet ended up running off with Arven to search for the Herba Mystica. Later, Clavell called the teaching staff in order to inform them of Violet's backstory and explain his behavior.
Clive in Pokémon Adventures
In PASV03, in order to deal with Team Star, Clavell and two teachers traveled to West Province (Area One). They witnessed Violet driving off a pair of Team Star Grunts trying to forcibly recruit a girl named Penny. Shortly after Violet and Penny went their separate ways, the former received a call from someone going by the name "Cassiopeia". The mysterious caller recruited Violet and Arven as members of Operation Starfall, a plan to defeat Team Star's five squad bosses and force the group to disband. When Violet and Arven arrived at the Segin Squad's Base, they were approached by Clavell. Disguised as a student named Clive, Clavell requested to be included in Operation Starfall, which Cassiopeia accepted. Violet was unable to see through his disguise, much to Arven's bafflement, but Clavell quietly told Arven to play along.
In PASV05, Violet and Arven battled through waves of Grunts while Clavell played support by healing their injured Pokémon. Once the Grunts were defeated, their boss Giacomo stepped out. Using the Tera Orb Clavell gave him, Violet defeated Giacomo, Accepting his defeat, Giacomo stepped down as a boss before revealing that Team Star's prolonged truancy was because they were waiting for their true leader, the "big boss", to return to them.
Clavell was introduced as a Supporter card in the Pokémon Trading Card Game during the English Scarlet & Violet Series (the Japanese Scarlet & Violet Era). It was first released in the Japanese Triplet Beat subset and the English Paldea Evolved expansion, with artwork by Hitoshi Ariga. An ultra rare version of the card with artwork by Sanosuke Sakuma was released in the same sets. It lets players search their deck for up to three Basic Pokémon with 120 HP or less, reveal them, and put them in their hand. Afterwards, the player shuffles their deck.
Clavell's alter ego Clive was introduced as a Supporter card in the Pokémon Trading Card Game during the English Scarlet & Violet Series (the Japanese Scarlet & Violet Era) as well. It was first released in the Japanese Shiny Treasure ex subset, with artwork by GOSSAN. It allows players to draw two cards for each Supporter card in their opponent's hand.
Clavell's Trainer ID is 209896. He has the same ID as Grusha.
Clavell and Nemona are the only character in the League Club Room that doesn't trade to the player a Pokémon or a pre-evolution of a Pokemon that they are seen using in battle, that being Pawmo and Paldean Tauros.
However, in the first cutscene of the game, they're seen using Pawmo's pre-evolution, Pawmi, and Tauros.