A powerful and greedy Pokémon collector could be the main antagonist. He wants to capture Ash, now in his Mew form, to add to his collection. He has all sorts of high - tech devices and trained Pokémon to try and catch Ash.
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.
Pikachu would most likely be there. Since Pikachu is Ash's closest companion, it would be involved in any story related to Ash. Maybe Pikachu could also have some sort of interaction with Mew, like being a bit jealous at first of Ash's new connection with Mew.
In fanfiction, the relationship between Ash and Female Mew can be very interesting. It often involves unique storylines where Ash might encounter Mew in a different context than in the original Pokémon series. For example, the fanfiction could explore how Ash's adventures change when he has a special bond with Female Mew. Maybe they go on a journey together to discover new Pokémon or face a powerful enemy that only they can defeat as a team. This relationship in fanfiction can bring out different aspects of Ash's character, such as his compassion and determination in a new light.
Perhaps it would be a combination of forces that save Ash. His own Pokémon, led by Pikachu, could start the rescue mission. Along the way, they might encounter some friendly Pokémon trainers who offer their help. And there could also be some unexpected help from a Pokémon that Mew least expects. This Pokémon could have some sort of connection to Mew and be able to convince it to let Ash go or help Ash escape while Mew is distracted.
Often, it starts with Ash being in awe of Mew's rarity and power. Mew, seeing Ash's pure heart, decides to approach him. Then they start to trust each other more as they face challenges together, like saving a group of Pokemon from a natural disaster.
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.
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.
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.
One common theme is friendship. Ash and Mew often form a special bond in these fanfictions, like in 'The Friendship of Ash and Mew' where they rely on each other to overcome difficulties. Another theme is adventure. They go on various quests together, exploring new places and encountering different Pokémon.