Arven is an upperclassman at the Naranja AcademyS/Uva AcademyV. He is skilled at cooking, and is a researcher of healthy recipes to make Pokémon feel better.[2] He always carries a copy of the Scarlet BookS/Violet BookV with him.[3] He is enrolled in the humanities track of the Academy, with his homeroom teacher being Salvatore.
Spoiler warning: this article may contain major plot or ending details.
As the son of the professor, he never saw them in his life because of their devotion to their work, creating a strained relationship. Because of this, he grew up independent, learning to cook and clean, with his only companion being his Mabosstiff. He enjoys picnics, especially their outdoor settings and the Sandwiches made.
Prior to the player starting their adventure, Arven lived at the lightouse lab on Poco Path with his parent. One day, Professor Sada/Turo brought a KoraidonS/MiraidonV to their home and told Arven to keep it a secret. Later, the Legendary Pokémon attacked Wild Pokémon, and multiple people witnessed it. With the secret out, the professor brought the Paradox Pokémon back to their lab in Area Zero, and Arven would not see them again until the events of the game. Due to this, he blamed KoraidonS/MiraidonV for taking his parent away from him and developed a hatred towards the legendary. Eventually, he explored Area Zero with his Mabosstiff to find his motherS/fatherV, only for it to be attacked by a creature he describes as either "rampaging"S or "metallic, machine"V. After taking a Flying Taxi out of The Great Crater of Paldea, he tried to heal Mabosstiff using a Pokémon Center and Potions, only to have failures due to its injuries being a special case. In desperation, he skipped his classes to research and attempt almost every cure available, yet he was not successful.
The player and Nemona first meet Arven on Poco Path, after meeting and being rescued by KoraidonS/MiraidonV. Arven was searching his old home, the lighthouse lab, where he found a book previously owned by the professor, the mysterious Scarlet BookS/Violet BookV. When Nemona recognizes him as their son, he becomes angry and tells her that his parentage doesn't matter. Still, he is surprised to see KoraidonS/MiraidonV outside of Area Zero, and the weakened state that it is in. After he learns the truth of what actually happened, he challenges the player to a battle with his newly caught Skwovet to test whether or not they can control the Paradox Pokémon. In defeat, he lets the player take the legendary off of his hands and gives them either Koraidon's Poké BallS or Miraidon's Poké BallV and runs down Poco Path on his way to Naranja AcademyS/Uva AcademyV, while Nemona yells at him to answer her questions.
After the player's first class, Arven is waiting for them at the Cafeteria. Already knowing their name due to them becoming a school celebrity, he asks the player to help make his dream a reality: to help him defeat five Titan Pokémon so he can create recipes with the Herba Mystica, special herbs that heal any Pokémon that eats them. From his research in the Scarlet BookS/Violet BookV, the titans are incredibly strong, but because he isn't proficient at Pokémon battles, he requires the help of a strong trainer, hoping the player would assist them. He asks them to think it over, and registers the locations of the titans on their Rotom Phone's map.
After attending the Academy's opening ceremony for the annual "Treasure Hunt," he finds the player and Nemona in the center of Mesagoza, below the steps to the Academy, conversing about Pokémon Gyms. He scolds Nemona for suggesting that the player would attempt to reach Champion Rank instead of assisting him in acquiring the Herba Mystica, much to her surprise and disapproval. When the player receives a sudden call from the mysterious character Cassiopeia regarding disbanding Team Star through defeating the bosses, he once again criticizes the idea, but is surprised when the stranger mentions him by name. After Nemona assures the player that they are free to follow whichever path they choose, Arven almost reveals his true intentions in his quest, but quickly changes the subject, mentioning how he plans to create the world's greatest sandwiches with the Herba Mystica. At this mention of sandwiches, KoraidonS/MiraidonV exits their Poké Ball, angering Arven. The player mounts the legendary, and he tells them that the best start on their search for the Titans will be past the east gate of the city. Afterwards, he leaves in frustration when Nemona recommends the opposite west gate for the path towards the Gyms, informing the player that he will see them soon.
Arven is shown with a Maschiff in Battle Studies Classes, despite his Mabosstiff already being evolved in the story and not being shown to own a different Maschiff anywhere else in the game.
Excluding Mabosstiff, all of Arven's Pokémon are related to food or cooking; Cloyster represents oysters, Toedscruel represents mushrooms, Garganacl represents salt, Scovillain represents peppers and spices and Greedent is known to collect and store Berries.
