In a fanfiction where Ash becomes a Riolu, the story could start with Ash being exposed to a strange energy in a new region. This energy mutates him into Riolu. As Riolu - Ash, he might enter Pokémon battles in a different way. Instead of directing from the sidelines, he is now in the thick of it. His friends would be shocked but would quickly try to find a way to reverse the transformation while also helping him make the best of his new form.
Well, the plot could involve Ash's transformation into Riolu being a result of some magical or scientific experiment gone wrong. Maybe he has to adapt to his new form and learn to use Riolu's abilities like Aura Sphere. He might also struggle with being recognized by his friends at first.
One possibility is that Ash turns into a Riolu because of a curse. In this fanfiction, he could be on a quest to break the curse. As a Riolu, he would have to communicate differently with his Pokémon partners. He may find that he has new instincts and has to control them while still trying to be the trainer - or in this case, the Pokémon - that his friends know.
In another plot, Riolu could be a Pokémon that has been abandoned by its previous trainer. Ash stumbles upon it while on his journey. At first, Riolu is very distrustful of humans, but Ash shows it kindness and patience. Through Ash's training methods and the bond he forms with his other Pokémon, Riolu slowly warms up to him and allows itself to be caught.
Well, perhaps Ash could be magically transformed into a Riolu. He might then struggle to adapt to his new form. For example, he would have to learn to use Riolu's unique moves like Force Palm in a completely different way compared to using his Pokémon attacks as a human. He could also face challenges in communicating with his old Pokémon friends as a Riolu.
Well, it could be about Ash finding a lost Riolu in the forest. Ash decides to take care of Riolu and train it. They go on adventures together, facing different Pokemon battles. Riolu could grow stronger under Ash's guidance and they might aim to win a big Pokemon tournament.
Another possibility is that the shiny Riolu has some special powers that Ash discovers. They could be related to a hidden legend in the Pokemon world. Ash and the Riolu then have to protect this secret from those who would use it for evil. They might travel to ancient ruins and encounter other mysterious Pokemon on this journey.
Perhaps the fanfiction could have a plot where Ash discovers a Riolu with some special abilities. He has to protect Riolu from those who want to use its powers for bad. This could lead to an adventure filled with battles and new friendships for Ash and Riolu. It might also explore the bond between Ash and Riolu as they grow together. Ash could learn new training techniques from Riolu's unique skills, and Riolu could learn about trust and friendship from Ash. There could be a big showdown at the end against an evil organization that wants to capture Riolu.
One possible plot could be that Ash finds a Riolu as his starter pokemon. Riolu is initially very shy and distrustful of Ash. But as they go on adventures together, Riolu starts to open up. They face challenges like battling against Team Rocket who tries to steal Riolu for its potential power. Ash has to train Riolu not just in battle skills but also in trusting him completely. This journey of building trust and growing stronger together could be a great fanfiction plot.
At first, his friends would be in disbelief. But then, they would start to adapt. Dawn might see it as an opportunity to study a Pokémon from a different perspective. Gary could be both amused and intrigued, and might offer some scientific theories on how it happened. Overall, they would all be concerned for Ash's well - being and work together to either help him get back to normal or help him thrive in his new form.
Well, perhaps it could be about a magical event that causes Ash to transform into a baby. Then his friends have to take care of him while also trying to find a way to reverse the transformation. Maybe Pikachu has to protect baby Ash from other Pokémon who might mistake him for an easy target.
Well, perhaps Ash could be transformed into a Mew through some magical encounter. He might then use his new form to explore the Pokémon world in ways he couldn't before, like flying high above the clouds and seeing the landscapes from a whole new perspective.
One possible plot could be that Ash suddenly transforms during a battle. His Pokémon friends are shocked at first. But then they realize he has gained some new Pokémon - like abilities. For example, he could communicate with Pokémon in a whole new way, understanding their deepest thoughts and feelings. This new form of Ash could lead his Pokémon team to victory in a big tournament, facing off against tough opponents and using his unique abilities to outwit them.