Perhaps the main plot is centered around Mew being in danger. Some evil organization has a plan to capture Mew and use its power for their own malicious purposes. Ash, being a big Mew fan, gets wind of this and sets out to stop them. He has to use his skills as a Pokemon trainer and his knowledge of the Pokemon world to outwit the villains and save Mew.
One possible main plot could be that Ash hears rumors about a Mew sighting in a far - off, unexplored region. So, he decides to embark on a journey to find it. Along the way, he meets new friends and foes, all while being driven by his desire to meet Mew.
Perhaps in this fanfiction, Ash discovers that he has a deeper connection to Mew than he ever thought. It could involve Mew choosing Ash as a special trainer to carry out a very important mission in the Pokémon world, such as saving a certain region from a new and powerful threat. This would lead Ash to face many challenges and grow in ways he hasn't before.
It could be that Mew has some sort of special power or knowledge that certain groups in the Pokémon world are after. They see Ash as an obstacle to getting what they want from Mew. So, they scheme to make everyone think Ash is untrustworthy. His friends, not knowing the truth, end up betraying him. Ash then has to fight against all odds to protect Mew and regain the trust of his friends.
In the 'ash is kidnapped by mew fanfiction', one possible plot is that Mew is acting out of a sense of desperation. It might believe that by kidnapping Ash, it can save the Pokémon world from a greater threat. Ash, being the protagonist, would then have to find a way to communicate with Mew and figure out what's really going on, all while trying to escape. Another idea could be that Mew is simply misinformed about Ash and thinks he's a danger, so it kidnaps him to protect the Pokémon realm.
Well, perhaps Ash could be transformed into a Mew through some magical encounter. He might then use his new form to explore the Pokémon world in ways he couldn't before, like flying high above the clouds and seeing the landscapes from a whole new perspective.
Well, if Ash were to turn into Mew in a fanfiction, it would be quite a wild turn of events. Mew is known for its ability to transform and its vast psychic capabilities. Ash, with his new form, could potentially travel to different dimensions that were previously inaccessible. He could also communicate with Pokémon in a whole new way, using Mew's psychic powers to understand their deepest thoughts and feelings.
In this kind of fanfiction, one possible scenario is that Ash forms a special bond with Mew. Mew, being the mythical and playful Pokemon, could lead Ash on an adventure full of surprises. Maybe it shows Ash some hidden powers within Pokemon that he never knew before. This could help him in his battles and his journey to become a Pokemon master.
There are indeed some. In these fanfictions, Mew might be portrayed as a special Pokemon that has a deep bond with Ash. It could be in a way where Mew helps Ash in his Pokemon journey in unexpected ways. For example, Mew might use its psychic powers to communicate with Ash's other Pokemon to make them stronger or understand Ash better. Some fanfictions also create a backstory for how Mew and Ash first met, which can be really interesting to read.
One possible plot could be that Ash is on a journey in a mysterious forest. He stumbles upon an ancient and powerful crystal. When he touches it, a strange energy envelops him and he starts to transform into Mew. As Mew, he has to adapt to his new form. He discovers he can fly and communicate with other Pokémon in a different way. He then uses his new abilities to help his Pokémon friends who are in trouble in a nearby cave, fighting off a group of powerful rogue Pokémon.
One consequence could be that Ash loses his human identity to some extent. His friends might not recognize him at first, and he would have to figure out how to communicate that he is still Ash inside. Also, his Pokémon might be confused about their trainer's new form.
One common theme is friendship. Mew and Ash form a special bond that helps Ash in his Pokemon - training. Another theme is adventure, as Mew might lead Ash to new and exciting places.