One idea could be that Ash discovers a young and injured Mew. He takes it upon himself to nurse Mew back to health. During this time, they form a deep bond and Mew starts to teach Ash some unique Pokémon moves that are not commonly known. This new knowledge gives Ash an edge in his battles.
Well, it could start with Ash having a strange dream about Mew. When he wakes up, he finds a strange energy signal that leads him to Mew. Mew is in trouble because it has lost its memory. Ash then tries to help Mew regain its memory. As they travel together, Mew slowly remembers bits and pieces of its past, and Ash gets to learn a lot about the history of Pokémon from Mew.
Team Rocket could be the main antagonists. They might hear about Ash's encounter with Mew and try to capture Mew for their own evil plans. They could set up all sorts of traps and schemes to try and separate Ash from Mew and steal Mew away.
Well, in some 'ash mew starter fanfiction', the plot could revolve around Mew choosing Ash as its trainer. This is quite interesting because Mew is such a powerful and rare Pokémon. The story might then show how Ash and Mew form a special bond, different from the bonds he has with his other Pokémon. They could face challenges from other trainers who are jealous of Ash having Mew.
The plot could start with Ash getting Riolu as his starter Pokémon instead of Pikachu. Riolu might be a bit of a troublemaker at first, not fully understanding Ash's commands. But as they journey together, they start to understand each other better.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). They have a large collection of Pokémon fanfictions, and there's a good chance you'll find some 'ash mew starter fanfiction' there.
One plot idea could be that Ash and Datini start on a journey to find a lost magical artifact. Along the way, they encounter various obstacles and have to use their combined skills to overcome them.
First, do your research on both Ash and Mew. Know their personalities, abilities, and storylines in the Pokémon universe. For example, Ash is a determined and kind - hearted trainer, while Mew is a rare and powerful psychic Pokémon. Then, come up with a unique plot. It could be something like a magical accident that causes the transformation. Next, focus on how Ash would react in Mew's body. He would likely be both excited and a bit scared at first. Use vivid descriptions to bring the story to life, like describing how it feels for Ash to fly as Mew or use its psychic powers. Also, don't forget to include other characters' reactions, such as Pikachu's confusion or Misty's shock.
One possible plot could be that Ash discovers a Larvitar in the wild. He decides to make it his starter Pokémon. They then embark on a journey together, facing various challenges like battles against other trainers and wild Pokémon. Larvitar evolves over time, growing stronger with Ash's guidance and training.
The plot could revolve around Ash and Squirtle's first days together. Squirtle might be the only Pokemon Ash has at the start. They could enter a local Pokemon competition where Squirtle has to face tough opponents. Ash would need to strategize using Squirtle's water - based moves. Along the way, they meet a mysterious trainer who gives them a tip on how to improve Squirtle's speed, which helps them in future battles.
I don't know the exact plot as I'm not familiar with this specific fanfic.
Well, the plot could be about Ash starting his journey with a Pidgey as his first Pokémon. Maybe he faces challenges in training it to be strong enough to take on gym battles. He could encounter other trainers who underestimate him because Pidgey is a common starter, but Ash proves them wrong as he and Pidgey grow together.