One interesting storyline could be a human with a special bond to a Legendary Pokemon. For example, a trainer who discovers they have an ancient connection to Mewtwo. They might go on a journey to understand this connection and in the process, face challenges from other trainers or organizations who want to use this connection for their own gain.
Another storyline could involve a human becoming a Legendary Pokemon in a strange turn of events. This could be due to a magical spell gone wrong or an experiment. The human-turned -Legendary would then have to navigate the Pokemon world with new powers and a different perspective, while also trying to find a way to turn back.
One interesting storyline could be the children having to discover and control their latent powers inherited from the legendary Pokemon. They might face challenges like being hunted by those who want to use their powers for evil.
One interesting storyline could be Ash getting a legendary starter that has a unique bond with him. For example, it might be able to communicate telepathically with Ash. This could lead to them having a deeper understanding of each other and facing challenges in a new way.
Maybe a story where Ash is transported to a realm where human legendaries live. He has to navigate their complex society and politics. The human legendaries might be divided into different factions, some believing in isolation from the normal Pokémon world, while others think they should be more involved. Ash could become a mediator, trying to bring peace between these factions while also learning about the unique powers and histories of these human - like legendaries.
A plot could involve a human accidentally stumbling into the hidden realm of Legendary Pokemon. There, they have to prove themselves worthy to the Pokemon and in the process, they develop a unique friendship. The human then uses this new - found relationship to bring peace between humans and Legendary Pokemon who have long been in conflict due to misunderstandings.
Maybe a story about a human who accidentally stumbles into the hidden realm of Legendary Pokemon. There, they form a friendship with a Legendary that is an outcast among its kind. Together, they try to change the perception of the outcast Legendary in its own community while also finding a way for the human to return home.
One common theme is friendship. Humans and Legendary Pokemon often form deep bonds of friendship in these stories. Another theme is adventure, as they usually go on exciting quests together.
One possible plotline could be Ash's discovery of his own latent legendary powers. Maybe he starts to exhibit abilities that are unique to legendary Pokemon, like controlling the weather or having an extraordinary bond with all types of Pokemon.
A great Pokemon legendary fanfiction is one that reimagines the battles between legendaries. For instance, a story where Giratina and Palkia have a rematch in a different dimension, and the outcome has far - reaching consequences for the entire Pokemon universe. Some fanfictions also explore the idea of legendary Pokemon living in the human world incognito. Like a story where Lugia disguises itself as a normal seagull to observe humans and ends up befriending a small group of children who have an uncanny ability to sense its true nature. There are also those that focus on the mythology behind the legendaries. For example, a story that tells the ancient tales of the creation of the world by Arceus and how the other legendaries came to be in relation to that creation.
In some Pokemon highschool fanfiction, there are storylines centered around Pokemon battles being part of the school curriculum. For example, a group of students might be preparing for a big inter - school battle tournament. They face challenges like training their Pokemon in limited time, dealing with injuries, and also strategizing against other schools' teams. This creates a lot of drama and excitement within the story.
One interesting storyline could be about a trainer who discovers a rare and powerful Pokemon that has been hidden in an ancient ruin in the Unova region. This Pokemon has unique abilities that no one has ever seen before.