The plot could involve Ash trying to get back to his normal form. He has to go on a journey as Dratini to find a way to reverse the transformation. Along the way, he meets other Pokemon who either help or hinder him. Maybe he has to face some challenges that are specific to his Dratini form, like fitting into small spaces or using his new abilities to cross obstacles.
A possible plot is that Ash - as - Dratini gets separated from his friends. He has to rely on his new Pokemon instincts to survive. He discovers new things about the Pokemon world from this different form. He might find a group of Dratini and befriend them. But there are also some mean Pokemon who try to bully him because he's different. He has to prove himself and also figure out how to tell his friends where he is when he finally gets the chance.
Well, here's how it could go. Ash is in the middle of a battle when a strange energy surrounds him. The next moment, he's no longer Ash. He has become Dratini. His trainer friends are shocked. As Dratini - Ash, he has to figure out how to communicate. He wiggles his long body and makes some hissing sounds. He realizes he can still understand his friends, but they can't understand him easily. So he tries to use his new body to show them what he wants to say.
The plot might involve Ash's Dratini evolving quickly due to their unique connection. It could also have elements of Ash trying to prove that Dratini can be a very powerful Pokémon from the start. He might enter it into Pokémon contests and battles, showing off its unique moves and abilities.
In the fanfiction, perhaps Ash catches Dratini during a quest. He hears rumors about a rare Dratini in a certain area. He goes there and finds Dratini being chased by some other Pokemon. Ash steps in to protect it and earns Dratini's trust. The story could then focus on their adventures together, exploring new regions and facing tough opponents with Dratini by his side.
Dratini's character could be developed by showing its initial shyness. Since it's a relatively rare and often timid Pokemon, it might be scared of Ash at first. But as Ash shows kindness, Dratini could start to open up. Maybe it would show its playfulness when it gets more comfortable around Ash and the other Pokemon in his team.
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.
It could be a legendary Pokémon in disguise. Legendary Pokémon sometimes interact with trainers in mysterious ways. This one could have chosen Ash to receive the Dratini egg as part of some grand plan to help Ash become an even greater trainer and perhaps save the Pokémon world from a future threat.
Ash would likely become more responsible. Since Dratini is a relatively rare and potentially powerful Pokémon, he'd have to take extra care. This could make him think more before acting in battles and other situations.
A cool plot could be that Ash turns into a Eevee. Since Eevee can evolve into multiple forms, Ash - as an Eevee - would constantly be in a state of potential change. Other Pokemon might try to influence his evolution in different directions. His friends would be on a quest to find a way to turn him back, but in the process, Ash - as Eevee - discovers that he can access some of his old human memories and use his strategic thinking in Pokemon battles. This gives him an edge in the wild and helps him protect himself and his new Pokemon friends.
One popular story could be about Ash and Dratini's adventure in an uncharted forest. They might encounter rare Pokémon and have to work together to overcome challenges. In this story, Dratini could start evolving during a tough battle, which adds an exciting element.
Well, in the fanfiction, Ash might start by being super excited about getting the Dratini egg. He could be very protective of it, constantly checking on it and making sure it's in a safe place. Maybe he'd research all about how to take care of a Dratini egg, like the ideal temperature and humidity.