One interesting Lampent fanfiction could be about Lampent guiding a lost trainer through a spooky forest. It might use its unique abilities to light the way and protect the trainer from other dangerous Pokemon.
One interesting fanfiction could be where Ash finally achieves his dream of becoming a Pokemon Master in a really unexpected way, like by forming a unique bond with a legendary Pokemon that helps him win a super tough tournament.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. They have a wide range of Pokemon fanfictions, and you can search specifically for Lampent ones using the search bar.
A really cool fanfiction might be set in a world where Hatterene is a sort of guardian of an ancient and mysterious place. The story could follow a young adventurer who stumbles upon this place and has to gain Hatterene's trust. Hatterene tests the adventurer with various challenges, and as the adventurer overcomes them, they learn more about Hatterene's past and the secrets of the place it guards.
One interesting Pokemon Kirlia fanfiction could be about its journey of evolution. Maybe it struggles to control its psychic powers as it evolves from Ralts to Kirlia, and then has to overcome various challenges to reach its final form. Another could be a story where Kirlia forms a unique bond with a trainer who has a special psychic ability too, and they go on adventures together.
Well, there are fanfictions where Cress is part of a team exploring an unknown region in the Pokemon world. He discovers new Pokemon species and has to figure out how to deal with the unique ecosystems there. Some fanfictions also explore his backstory, like where he came from and what inspired him to start his Pokemon journey in the first place. In a really detailed fanfiction, it could show his growth not just as a trainer, but also as a person, learning important life lessons through his Pokemon adventures.
Another type of fanfiction could focus on Hilda's relationships with other characters. Maybe she teams up with a rival in an unexpected way, like they have to work together to save a group of endangered Pokemon. This would show a different side of their characters and how they grow through the experience.
One interesting Riolu fanfiction could be about Riolu's journey to become a Lucario while facing various challenges in the wild. It might include battles with other Pokemon and forming unexpected friendships.
One interesting Pokemon Steven fanfiction could be about his adventures in a new, uncharted region. He might discover rare Pokemon and form unique bonds with them. Another could be a story where he teams up with other trainers to face a powerful, mysterious threat to the Pokemon world.
One interesting Pokemon Gladion fanfiction could be about his journey to find and bond with his own unique Pokemon. It might show his growth from a somewhat aloof character to one who truly understands the power of friendship with his Pokemon partners.
There are fanfictions where a Pokemon that has been abandoned by its previous trainer is then adopted by a new one. The new trainer is overprotective of this Pokemon because they know of its past trauma. For instance, an Eevee that was mistreated before. The trainer might not let it participate in any battles at first and showers it with love and care. They make sure it has the best food, the coziest place to sleep, and is always by its side to make it feel safe again.