Well, in this fanfiction, perhaps Ash stumbles upon a Mudkip that was abandoned by its trainer. Feeling sorry for it, Ash takes it as his starter. They start their journey together, and the Mudkip has an unusual ability to communicate with water - type Pokémon. This leads to some interesting adventures as they encounter water - based mysteries and help other Pokémon in distress. They also have to prove themselves to other trainers who doubt a Mudkip as a starter.
Perhaps a dark - themed Pokémon organization that is researching the unique powers of Mudkip. They see Ash's Mudkip as a key to their experiments. So they send out their agents to capture it. These agents are skilled trainers with powerful Pokémon at their disposal, and they constantly pose a threat to Ash and his Mudkip throughout the fanfiction.
Maybe in the fanfiction, Trapinch is a rare and special Trapinch that has some kind of ancient power. Ash discovers this and has to protect Trapinch from villains who want to use its power for evil. Along the way, Ash and Trapinch form a really strong bond as they face these threats together.
The plot could involve Ash and Chimchar facing a series of challenges in a new Pokémon league. They might encounter a powerful villain who has a special device that can nullify Chimchar's fire attacks. Ash then has to find a way to train Chimchar to use its other skills, like its speed and agility, to defeat the villain's Pokémon.
One possibility is that Ash discovers a young Rayquaza at the start of his journey. Maybe it's injured and Ash nurses it back to health. This could lead to a strong bond between them, and Rayquaza could become his most powerful Pokémon, helping him in battles against tough opponents like Team Rocket or other powerful trainers.
Well, it could start with Ash being in a new region where Treecko are very rare. He stumbles upon a young Treecko that is being bullied by other Pokémon. Ash steps in to protect it, and Treecko, seeing Ash's kindness, decides to join him. Their journey together focuses on exploring the unique ecosystems of this new region. Treecko has to adapt to new battle styles and opponents. Ash and Treecko also befriend a group of local Pokémon trainers who help them understand the secrets of the region. In the end, they face a powerful trainer who has a team full of strong Pokémon, and they have to use their combined skills and the knowledge they've gained to win the battle.
One possible plot could be that Ash discovers a Larvitar in a mysterious cave. The Larvitar is injured and Ash decides to take care of it. As they journey together, Larvitar starts to grow stronger and they face various challenges in Pokemon battles. Eventually, Larvitar evolves into Pupitar and then Tyranitar, becoming one of Ash's strongest Pokemon.
In this fanfiction, perhaps Ash starts with a Eevee. Since Eevee can evolve into multiple forms, it would add a whole new dimension to his journey. He could face different challenges as he tries to decide which evolution path to take for Eevee, and it would also attract different kinds of Pokémon opponents.
The plot could involve the female Ash and her Dratini exploring new regions not seen in the original series. They could discover ancient Pokémon secrets. For example, Dratini might lead Ash to a hidden cave filled with rare dragon - type Pokémon. Ash has to learn how to train Dratini in a way that suits its unique abilities. Maybe she focuses on Dratini's speed and special attacks rather than brute force. This journey of discovery and growth would be the main focus of the fanfiction.
One possible plot could be that Ash, instead of starting with Pikachu, starts with a Gastly. Gastly could use its spooky abilities to help Ash in battles. For example, it could use its ability to turn invisible to surprise opponents. It might also play pranks on Ash's rivals, like making them think they're seeing ghosts in the forest where they're camping.
Well, one possible plot could be that Female Ash starts her journey with a Datini. Maybe she discovers Datini has some unique abilities that set them apart from other starters. They could face challenges in the first gym battle together, with Datini using its speed to dodge attacks and Female Ash coming up with creative strategies.