In this fanfiction, perhaps Ash gets the Riolu egg in a very special way. For example, he might find it in an ancient ruin where he also discovers some secrets about Riolu's evolution. The story could then revolve around Ash's attempts to understand these secrets while keeping the egg safe. He might have to battle strong Pokémon to protect the egg and the knowledge he has gained. Once the Riolu hatches, it could have some unique abilities related to the secrets Ash uncovered.
Well, it could be about Ash's journey with the Riolu egg. Maybe he has to protect it from various dangers in the wild. He might face off against Team Rocket who are trying to steal the valuable egg. Ash could also learn a lot about Riolu's species while waiting for the egg to hatch, like their natural habitats and behaviors.
The fanfiction might focus on Ash's bond with the unhatched Riolu. He could talk to the egg, share his dreams and experiences with it. As he travels, he meets different Pokémon trainers who give him advice on how to take care of the egg. And when the Riolu finally hatches, it could immediately form a strong connection with Ash because of all the care he gave the egg.
One possible adventure is that Ash has to travel through a dangerous forest with the Riolu egg. There could be wild Pokémon that are attracted to the egg's energy and try to attack. Ash would have to use his other Pokémon to fend them off. Another adventure could be in a big city where there are thieves who target rare Pokémon eggs. Ash has to outsmart them to keep the Riolu egg safe.
One possible plot could be that Riolu is being chased by some bad guys who want to use its power. Ash rescues Riolu and they team up. As they journey, Riolu learns from Ash's kindness and determination. They enter Pokémon battles together, and Riolu's unique fighting style combined with Ash's strategies help them win. Also, their relationship could grow deeper, with Riolu becoming one of Ash's closest Pokémon companions.
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.
In this fanfiction, Ash might take really good care of the Pokemon egg. He would probably keep it warm and safe, waiting eagerly for it to hatch. Maybe he'd even talk to the egg, like he does with his other Pokemon friends.
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.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Ash gets a Riolu' in their search bars, and you might find some relevant stories.
It could be a fan - made story where Ash has a special connection or interest in Riolu. Maybe it involves Ash's adventures with a Riolu, like training it or going on quests together.
The fanfiction could revolve around Ash and Riolu's bond. Since Riolu can sense auras, it might be able to sense Ash's strong will and determination. They could go on an adventure to discover more about Riolu's species and its hidden powers. Along the way, they meet other trainers and Pokémon, and Riolu grows stronger with Ash's guidance.
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, 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.