One idea could be a Riolu crossover with the Pokemon Mystery Dungeon world. Riolu could be a new recruit in a rescue team, facing various challenges in dungeons and making new friends among different Pokemon species. Another idea is a crossover with a fantasy world like Harry Potter. Riolu could be a magical creature in Hogwarts, perhaps befriending some of the students and getting involved in the magical adventures there. Or a crossover with a post - apocalyptic world where Riolu uses its fighting abilities to survive and protect other Pokemon.
First, decide which world you want Riolu to cross over into. For example, if it's a crossover with the Star Wars universe, research about the different planets, species, and the Force in Star Wars. Then, think about how Riolu's abilities fit into that world. Next, create an interesting plot. Maybe Riolu is a stowaway on a spaceship and gets involved in a galactic conflict. Start with an engaging opening scene, like Riolu waking up in a strange new place in the Star Wars galaxy.
Riolu could start off as a shy and scared Pokemon. But as it spends more time with Ash, it would become more confident. It might learn new moves and become more brave in battles, evolving into Lucario eventually as it gains more experience and trust in itself.
Riolu's personality could develop in a way that it becomes more confident. At first, it might be scared of battles and new situations. But as Ash encourages it and they have small victories, Riolu starts to believe in itself. For example, after winning a small battle against a weak pokemon, Riolu realizes it has the potential to be strong.
One possible fanfiction could be about Riolu and Kirlia's adventure in a lemon grove. They might discover a magical lemon that gives them special powers. Riolu could use its fighting skills and Kirlia its psychic abilities to protect the lemon from some villains who want to use it for evil purposes.
Riolu may become more confident. As it transforms, it realizes it has new powers and abilities. For instance, if it gains the ability to sense auras more strongly, it becomes more self - assured in battles and interactions with other Pokemon.
Growth and development is another theme. Baby Riolu is at the start of its journey, so stories might focus on it getting stronger, learning new moves, and evolving. For example, it might struggle at first but through hard work and determination, it overcomes challenges and becomes more powerful.
One idea could be that Ash has a strange encounter in a mysterious forest. There, he finds a Riolu in distress. As he tries to help the Riolu, a strange energy transfer occurs, and he starts to take on some of Riolu's characteristics. He might gain Riolu's heightened senses, like its ability to sense auras more acutely. This could lead to new adventures as he has to adapt to these changes while still trying to pursue his Pokémon journey goals.
Yes, there are many. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. There, you'll find various stories that combine the elements of Danny Phantom and Riolu. Some might be adventure - based, where Riolu teams up with Danny in his ghost - fighting adventures. Others could be more about friendship, exploring how Riolu and Danny's characters interact and grow together.
In a fanfiction, perhaps there is a world where lemons are a rare and precious resource. Kirlia and Riolu are sent on a mission to retrieve some lemons from a dangerous area. Along the way, they face various challenges and have to rely on each other's strengths. Kirlia's ability to sense things from afar with its psychic powers helps them avoid some traps, and Riolu's combat skills protect them from wild Pokémon. The story could be about their journey and the bond they form during this lemon - related quest.