Maruto was placed in the game referencing the anime character Naruto, from the hit anime series Naruto, and Naruto: Shippuden. Maruto has 2 Pokémon which actually refer to things from Naruto. The Ninetales refers to the nine-tailed demon fox that was sealed within Naruto at birth, and his Poliwhirl is a reference to the seal on Naruto's belly being swirled like Poliwhirl's swirl. Both Maruto and Naruto are blond-haired, and Maruto is just as poorly dressed as Naruto.
Both Maruto and Naruto's catch phrase is "BELIEVE IT!," and both have said "WHAT DO YOU KNOW!?" before. The two characters are also loud and boisterous.
It was revealed in the cutscene to Route 15 that he is in possession of Kyogre.
After Ash saves the pair from Mewthree, Maruto and Joey return to the gym, where you have defeated Kyogre. After Kyogre requests being transported in a Pokéball, he and Joey both want the honor. The three of you progress to the Nugget Bridge, where the Player is forced to cross first.
Still on the Nugget Bridge, Maruto and Joey meet Bill in his Kabuto costume. Although Maruto gets scared, Joey recognizes the costume right away from its appearance in the anime. Once you receive SS Anne tickets, the two of them abruptly leave and head for Route 5 to train.
Having entrusted Maruto to the care of Team Rocket, the Player decides to take a break on Route 12. After the level, Giovanni claims that Maruto needs to be transported to Saffron City for urgent care.
After being brought into Saffron City, Maruto awakens and reveals himself to be Sabrina in disguise. Mewthree had planned for her to infiltrate Saffron City and take it over from the inside, along with the captured Mewtwo.
The Giant Muk helps Maruto out of his disguise. It is revealed that Maruto was in Mewthree's mind control, but when he reached Fuchsia he snapped out of his control. He goes in the Safari Zone with you and Joey and explains the rules.
Maruto plays a minor supporting role in the introductory cutscene to the level; he follows behind the Player, ignoring Joey's complaints and continuing on with the Player to Route 17. When he arrives on Route 17 with the Player and sees Gary and Zapdos, his only words are "Zapdos!"
Maruto asks why Zapdos's still standing. Joey says he is ready to sacrifice himself, Maruto says that he is his hero. After Zapdos had taken Gary away, he sends out Kyogre at the South entrance of Fuchsia City.
Maruto is standing on Kyogre with you, Joey, and Pikachu. When Pikachu says something, Joey says he agrees with him. Maruto also agrees, but Kyogre claims that Pikachu only sneezed. When Kyogre stops swimming, Maruto screams as he falls to the ground.
When Joey says that he is the chosen one, Maruto says that Blaine wasn't talking about him. In Pallet Town, Maruto asks why nobody is ever around. When Joey says that it is because it's hard to stand around someone like him. Maruto says that it is because of the smell of Joey.