Yes, there are likely Naruto fanfictions that involve Lucario. Fanfiction writers often create crossovers between different fandoms, and the idea of Naruto having an encounter or some sort of connection with a Lucario from the Pokémon universe can be an interesting concept for many writers to explore.
There are several places to search for this type of fanfiction. Firstly, the big fanfiction platforms like FanFiction.net and AO3 as mentioned before. But don't forget about Tumblr. There are often fanfiction writers who post snippets or links to their works on Tumblr. You can search for relevant tags or join Naruto and Pokémon fan groups on the platform. Additionally, Reddit has some great fanfiction communities where people might be aware of or even have written a 'Naruto has a Lucario' fanfiction.
At first, their interaction might be a bit rocky. Naruto's loud and boisterous personality could startle female Lucario. However, as they get to know each other, they would find common ground. For example, they both have a strong sense of loyalty. Naruto to his village and friends, and Lucario to her own kind. This common trait could lead to a deepening of their relationship, and they might start to rely on each other in battles and difficult situations.
One possible plot could be that Naruto discovers a strange portal during one of his missions and ends up in the world where female Lucario exists. They initially have a misunderstanding and fight, but then realize they can help each other. Naruto could teach Lucario about the concept of friendship like he has with his comrades in his own world, and Lucario could teach Naruto some unique combat skills that are different from the ninja arts.
I'm not sure specifically as there could be many interpretations. It might be a fan - created fictional story where Ash from Pokémon has some sort of adventure or relationship involving a Lucario.
In an adult fanfiction, it could explore the more mature aspects of their relationship, not in a sexual way but perhaps in terms of their loyalty and understanding of each other. For example, they could be on a quest to save their Pokémon community from a great danger, and their combined strength and trust in one another is what gets them through.
In fanfiction, the relationship between Ash and Female Lucario can be very interesting. It often involves adventures where they work together. Their bond might be depicted as a strong friendship or something more. For example, they could be on a journey to save a particular region, and during this time, their mutual understanding and respect for each other grow.
Ash and Female Lucario in fanfiction can also represent different values. Ash might symbolize courage and determination, while Lucario could stand for loyalty and power. Their combination in the story can convey important messages about friendship and cooperation.
One great fanfiction could be about a female Lucario's journey to master new Aura techniques. It could involve her training with other Pokemon and trainers, facing challenges and growing stronger. This type of story would focus on her character development and the unique bond she forms with those around her.