Well, it might be that Gary has been influenced by some dark force or power. He kidnaps Ash to use him as a bargaining chip. Maybe he has fallen in with a bad group who wants to take over the Pokémon regions, and they think Ash, with all his knowledge and connections, can be useful. So Gary is sort of forced to do the kidnapping but also has his own motives like getting rid of his long - time rival.
In this kind of fanfiction, perhaps Gary has some extreme jealousy towards Ash. Maybe he kidnaps Ash because he wants to prove himself superior in the Pokémon world. He could be tired of always being in Ash's shadow and thinks this is a way to get the upper hand.
One possible plot could be that Gary has a deep - seated grudge against Ash that has been festering for a long time. He kidnaps Ash in a moment of rage. He might take Ash to a remote location, away from all his Pokémon and friends. Gary could then try to break Ash's spirit, maybe by challenging him to Pokémon battles under unfair conditions, or by trying to make him feel like a failure in the world of Pokémon training.
Pikachu would be a likely candidate. Pikachu is Ash's most loyal Pokémon and has a very strong bond with him. It would sense that Ash is in trouble and would go on a mission to rescue him. Pikachu could use its electric attacks to fight off Gary or any obstacles in the way.
Well, one possibility could be that Ash gets into a really dangerous situation in a battle against a super - strong and evil Pokémon trainer. Gary, who has always been his rival but deep down respects him, steps in at the last moment. He uses his unique Pokémon team and battle strategies to fend off the enemy and save Ash. Maybe Gary has been secretly following Ash's journey and realizes that Ash is the key to maintaining the balance in the Pokémon world, so he can't let him be defeated.
Well, it could be that Latias has been influenced by an ancient prophecy. According to this prophecy, Ash is the key to unlocking a great power. But she can't just ask Ash to come with her as she fears he will be stopped by his friends or other Pokémon trainers. So, she decides to kidnap him. As time passes, Ash manages to communicate with Latias and understand her motives. He then decides to cooperate with her, not because he has to, but because he realizes the importance of the situation.
In an 'ash travels with gary fanfic', perhaps they are on a mission to discover some ancient Pokémon secrets. They travel through different environments, from forests to mountains. Along their journey, they meet old friends and rivals, and their relationship evolves from just being competitors to real friends who support each other in battles and other challenges.
The plot could start with Gary getting the torso burn in a mysterious incident. Ash, being the kind - hearted trainer he is, decides to take care of Gary. This could bring out a softer side of Gary as he has to rely on Ash. As Gary recovers, they might start to understand each other better and form a stronger friendship that was previously overshadowed by their rivalry.
Well, it could be about Ash and Gary being on an adventure when Gary suddenly has an asthma attack. Ash has to use his knowledge of Pokémon to find a way to help Gary, like finding a plant that has medicinal properties. Maybe they're in a forest and Ash sends out his Bulbasaur to search for the right plant.
The plot could be as simple as Ash training an Electrivire in secret. When Gary challenges Ash to a battle, Ash unleashes the Electrivire, which is much more powerful than Gary expected. Pikachu could also be involved by taunting Gary's Pokémon during the battle, adding to the overall scare factor.
One possibility is that Artemis has been misinformed. Some enemy of Percy has tricked her into thinking that Percy is a danger to the demigods. So she kidnaps him to stop him from causing harm. But as she keeps Percy captive, she slowly realizes that she has been deceived when Percy starts to explain his side of the story and the real threats he has been fighting against.
The plot could involve the Phantom seeing Christine as his only salvation from his lonely and tortured existence. So, he kidnaps her with the intention of making her understand his world. He may show her his musical creations, hoping she'll come to love him in return. However, Christine might be initially terrified and try to escape.
In some fanfictions, Aizawa might be under the influence of a villain's quirk that makes him act against his will. So, he kidnaps Izuku, but later on, he realizes what he's done and tries to make amends. This could lead to a story full of drama and redemption.