It's not appropriate at all. Pokemon has a positive and clean image, and creating such erotic content related to its characters, like gym leaders, would be disrespectful to the brand and its fans. It also violates the moral and ethical standards expected in the fan community.
Obviously Ash is one of the most popular characters. And then there are the gym leaders like Brock, Misty (who also has gym - related aspects in some versions), and other gym leaders from different regions.
One idea could be that Ash uses his unique battle style which he has developed over his journey to create a really challenging gym. He might include Pokémon from all the regions he has visited in his gym battles, making it a diverse and exciting experience for trainers. For example, he could have Pikachu lead the charge as always, but also include some of his less common Pokémon like Heracross or Gliscor.
Well, it could be about Lanora challenging Ash to a gym battle. And during the battle, they start to respect each other's skills. Maybe Lanora realizes Ash's determination and they become friends.
The main characters are Lanora and Ash. Lanora, as a gym leader, has her own set of Pokémon and rules in the gym. Ash, on the other hand, is on his journey to become a Pokémon master. In this fanfiction, their paths cross and they interact, which forms the core of the story.
Well, in some ash gym leader fanfiction, there could be a story where Ash has to overcome personal challenges while facing a gym leader. Maybe he's feeling unconfident, but through his Pokémon's loyalty and his own determination, he manages to pull through. The gym leader might also have their own backstory that ties into the battle, making it more than just a fight for a badge.
One popular pairing is Ash x Misty. Misty is a Gym Leader and she has a long - standing relationship with Ash in the Pokémon series, so it's often explored in fanfiction.
His understanding of Pokémon could deepen further. Since he now has to design challenges for trainers, he would study Pokémon types and abilities more intensively. He might discover new strategies and combinations that he hadn't thought of during his regular journey. This could also make him more respected in the Pokémon community as a knowledgeable gym leader.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions on various topics, including Ash x Gym Leader ones. Just use the search function and type in relevant keywords.
There are many poems with rhymes. Here are some examples:
The mountain is heavy and the water is heavy. There is no way out. There is another village in the dark. Lu You's "Mountain West Village Tour"
The wind and waves will sometimes hang the clouds and sail across the sea. Li Bai's Difficult Journey
In April, peach blossoms begin to bloom in the mountain temple. Bai Juyi's Peach Blossom in Dalin Temple
The sunset clouds and lone ducks fly together in autumn water, sharing the same color in the sky. Preface to the Pavilion of King Teng by Wang Bo
5. In broad daylight, the Yellow River flows into the sea. Wang Zhihuan, Climbing the Stork Tower
These poems all have some rhyming characteristics, which can enhance the sense of rhythm and rhythm of the poem, making it easier for readers to understand and feel the emotion of the poem.