In a fanfic, the magical and Pokemon worlds could merge due to a spell gone wrong. Alain could befriend some of the Hogwarts students and introduce them to Pokemon. The Hogwarts grounds could become a new place for Pokemon training, with spells and Pokemon abilities interacting in interesting ways. For instance, a Pokemon's electric attack might interact with a Lumos spell in an unexpected way.
Alain could be a mysterious character. He might be like a wandering wizard who uses Pokemon instead of a wand. He could be an outcast at first, but as people see his unique abilities with Pokemon, they start to respect him.
Well, it could be about a battle of strategies. Maybe the Pokemon OC has some unique moves or abilities that Alain hasn't encountered before. So the plot could revolve around how Alain tries to figure out the OC's fighting style during the battle.
In some fanfictions, they can be made brothers. Fanfiction allows for a lot of creative interpretations, and writers might want to explore a different kind of relationship between these two popular characters.
One great 'Female Harry Potter Pokemon' fanfic is 'The Wizard and the Pokemon Trainer'. It combines the magic of the Harry Potter world with the charm of Pokemon in a really interesting way. The female Harry Potter character embarks on a journey where she discovers Pokemon in the Forbidden Forest. It has a really engaging plot that keeps you hooked from start to finish.
Well, another option could be to check out Pokemon - related forums. Sometimes, fans share their own fanfics or recommend good ones there. These forums are also a great place to interact with other fans who might have similar interests in Mairin and Alain's fanfiction.
It depends on how the OC is designed. If the OC has super - powerful and rare Pokemon, it might have an edge. But Alain is a very experienced trainer, so he could also win with his battle smarts.
One idea could be a story where Pokemon exist in the Harry Potter universe and students at Hogwarts can choose a Pokemon as their magical companion instead of a traditional owl or cat. Another could be a crossover adventure where Harry and his friends have to travel to the Pokemon world to retrieve a powerful magical item that has been lost there. Maybe a fanfic where a Pokemon trainer somehow ends up at Hogwarts and has to adapt to the wizarding ways while also using their Pokemon skills.