Well, perhaps the OC male is from a different region and he comes across a female Pokemon that is not native to his area. He tries to understand her unique abilities and in the process, they develop a friendship that helps him in his Pokemon journey. He might also use his knowledge from his home region to train the female Pokemon in a new way.
One idea could be that the OC male is a trainer who discovers a rare female Pokemon with special powers. He decides to train her and they form a strong bond as they face various challenges together. Another could be a story where the female Pokemon is in danger and the OC male has to go on a quest to save her, encountering other Pokemon and trainers along the way.
One idea could be creating an OC that is a hybrid of different Pokemon types. For example, a Pokemon with the features of a water - type and an electric - type. This could lead to unique abilities and an interesting backstory about how it came to be. Another idea is to have an OC that is a trainer from a far - off, unexplored region. This trainer could have different training methods and a whole new set of Pokemon not commonly seen in the main Pokemon world. You could also make an OC that is a Pokemon with a special power related to emotions, like it can heal other Pokemon's wounds when they are sad or boost their power when they are happy.
A really interesting plot might be that the Eevee is actually a reincarnation of a great Pokemon hero from the past. The trainer discovers this as they journey together and face various challenges. This knowledge makes them a target for an evil organization that wants to use the Eevee's power for their own malicious purposes. Along the way, the Eevee and the trainer meet other Pokemon and trainers who either help or hinder them in their quest to protect the Eevee's secret and fulfill its destiny.
One plot idea could be that the female oc is a Pokémon trainer who discovers a rare male bug Pokémon in an unexpected place, like a hidden forest glade. She tries to befriend it and train it, but the Pokémon is initially distrustful because of past experiences with humans. As they spend time together, they learn to trust each other and become a powerful team.
A possible plot is that the male OC is from a family of lemon farmers. One day, he finds a wounded Pokemon near his farm. He nurses it back to health and discovers that it has a special bond with lemons. This Pokemon can use the energy of lemons to power up its attacks. The OC then decides to travel with this Pokemon and enter the Pokemon world championships, facing many challenges along the way as they are both an unusual pair in the Pokemon - training world.
One idea could be that your female OC is a trainer from a small village in Kanto. She discovers a rare and injured Pokemon that no one has ever seen before. She decides to nurse it back to health and in the process, forms an unbreakable bond with it. This new Pokemon then helps her in her journey to become the best trainer, facing unique challenges along the way.
One idea could be to create an OC who has a unique ability that no other Pokemon trainer has. For example, the ability to communicate telepathically with all Pokemon types. This could lead to all kinds of interesting interactions and storylines, like befriending a wild and usually hostile Pokemon easily. Another idea is to have an OC SI from a different world or dimension where the rules of Pokemon are different, and they have to adapt to the new world while also sharing their own knowledge.
An interesting OC for a Pokemon Kalos fanfic could be a young artist who uses their Pokemon as models for their art. They travel around Kalos in search of inspiration and different Pokemon species to paint. Along the way, they meet other trainers and get involved in battles not just for victory but also to observe how Pokemon move and interact, which helps them in their art. This OC could also have a Pokemon with a unique coloration that they discovered during their travels.
One idea could be to create a story where two female Pokemon trainers from different regions meet during a big Pokemon tournament. They start off as rivals but gradually develop a deep bond as they discover they have more in common than they thought. For example, they both might have a special connection with a certain type of Pokemon, like Eevee. This shared interest could be the starting point of their relationship.
A mystery - themed 'the oc fanfic' would also be great. Maybe there's a mystery surrounding the Cohen family's wealth or a long - lost relative that suddenly shows up with a hidden agenda. The characters would have to work together to solve the mystery, and in the process, their relationships would be tested and new alliances formed.
One idea could be exploring an OC's (Original Character) journey to become a leader within the 100's post - apocalyptic world. They could start as an outcast and through their unique skills, like advanced medical knowledge or exceptional hunting abilities, gain the respect of different factions.