Once upon a time, Ash was exploring an ancient cave. There was a strange stone there. As he touched it, a powerful magic was released. His body began to morph. His arms disappeared and his legs fused together. His skin became scaly. His face elongated into a Dratini's snout. Ash was now Dratini. He swam through the air (as Dratini can do in the Pokemon world). He was amazed at how different the world looked from this new perspective. He saw his Pikachu looking at him with big, confused eyes. He had to find a way to let Pikachu know that it was still him, Ash, just in a different form.
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 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.
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.
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.
There are many great authors. Some might be known within specific fanfiction communities. One author could be someone who goes by the username 'PokeFan123'. Their stories often focus on the emotional bond between Ash and Dratini, and they write in a very engaging style.
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.
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.
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.
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.
His friends like Pikachu for sure. Pikachu would be there by Ash's side, probably as curious as Ash about the Dratini egg. Brock might also be involved. He could use his knowledge of Pokémon to give Ash some tips on taking care of the egg.
Well, in the 'Ash is given a Dratini egg fanfiction', perhaps Ash will form a really strong bond with the Dratini even before it hatches. He could start to feel a sense of responsibility like never before. And when the Dratini finally hatches, it could be a really powerful Pokémon that helps Ash in his future battles. He might also meet some new friends or trainers who are interested in his Dratini egg.