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.
Well, start with a strong concept. Imagine a world where Legendary Pokemon are hunted, and a small group of humans are trying to protect them. One of the humans forms a special bond with a Legendary, say Zekrom. The key is to build the relationship gradually. Show how the human and Zekrom learn to communicate, maybe through shared experiences or a common goal. Also, don't forget about the setting. Describe the environments where they interact, like a hidden cave filled with ancient Pokemon markings that holds a secret related to the Legendary Pokemon's power. This will make the fanfiction more immersive.
One great Ash x Legendary Pokemon fanfiction is 'A Bond Beyond Time'. In this story, Ash forms an unexpected connection with a Legendary like Mew. It's really interesting as it shows how Ash's kindness and determination attract the attention of such a powerful being. The author does a great job of building their relationship and taking the story in new directions.
Yes, there might be some out there in the vast world of fanfiction. However, it's important to note that such content often goes against the original intended nature of the Pokemon franchise which is more about friendship, adventure, and battles. Also, not all platforms may allow this type of fan - created content due to its deviation from the source material's spirit.
One problem is that it goes against the canon of the Pokemon series. Pokemon is about a trainer's journey, friendship, and battles, not this kind of relationship. Another issue is that it can be considered inappropriate, especially considering Pokemon has a large young fan base. It also might not be welcomed in the general Pokemon fan community as it strays far from the original concept.
One reason is that it gives more depth to Ash's character. When he's paired with a Legendary, we get to see how he adapts, grows, and learns from such a powerful partner. For example, in some fanfics where he's with Arceus, he has to deal with the responsibility of being associated with the 'God' of the Pokemon world. It also adds an element of the extraordinary to the Pokemon universe we already know and love.
There are also fanfictions where Ash catches Rayquaza. This could be set during a time when the sky is in chaos due to some dark energy. Rayquaza is drawn to Ash because of his pure heart and determination. Ash, with his usual courage, teams up with his pokemon to assist Rayquaza in restoring balance. As a result, Rayquaza allows Ash to catch it.
One of the common pairs is Dawn and Piplup. Their journey together in the anime can be the basis for a romantic story in fanfiction. The loyalty and closeness they showed in the show can be developed into a love story. Then there's Gary and his Eevee. Since Gary is a popular character, writers often explore a romantic relationship between him and his Eevee, perhaps with Eevee evolving into a form that is more compatible with a human - like relationship. And Brock and Onix have also been paired in some fanfictions, taking their trainer - Pokemon relationship to a different level.
It often starts with the human showing kindness. For example, if the human finds an injured pokemon and takes it in to nurse it back to health. This initial act of care begins the bond. Then, as they spend more time together, they learn about each other's habits. The pokemon might learn human language and customs, while the human learns about the pokemon's abilities and needs.
One interesting plot could be a human adopting a baby pokemon that was abandoned. The human has to learn how to take care of the pokemon's special needs, like its diet which might consist of certain berries or other pokemon - specific foods. They also need to protect the pokemon from other dangerous pokemon in the wild.