There are many great alternatives. For example, fanfics that focus on the growth and development of a new Pokemon trainer. They can detail the trainer's journey through different regions, catching new Pokemon, and competing in gym battles.
There could be a lot of interesting plots in such a fanfic. Maybe the male OC human accidentally enters the world of Pokemon in 2018 and meets a female Pokemon. They start an adventure together, facing various challenges and gradually building a deep bond.
One interesting concept could be the transformation process. How does a human physically and mentally change into a Pokémon? For example, do they retain their human memories? Another aspect could be the new abilities they gain. If a human turns into a Pikachu, they might discover the joys and challenges of using electricity - based attacks. Also, the social aspect within the Pokémon world is fascinating. As a former human, how would they interact with other Pokémon and trainers?
One plotline might be centered around the medical aspect. Since it's such an unusual situation, there could be a search for a healer or a scientist in the Pokemon world who can understand what is going on. Along the way, the human might encounter other strange Pokemon - related phenomena. Another could be that the human and the Pokemon that is involved in the pregnancy have a pre - existing relationship, like they saved each other's lives before. And now, this pregnancy is seen as a new chapter in their relationship. There could also be a plotline where the human's pregnancy starts to change the ecosystem around her, attracting different Pokemon or causing changes in the local environment, and she has to deal with the consequences.
One idea could be a story where a human trainer has a unique bond with a Pokemon that allows them to communicate on a deeper level, and they go on adventures together. Another could be a world where humans and Pokemon co - exist in a more integrated society, with some Pokemons having jobs like in a human town. And perhaps a story about a human who discovers a rare Pokemon and has to protect it from those who would use it for wrong purposes.
One idea could be a story where a human trainer has a special bond with a Pikachu that allows them to communicate telepathically. Another could be a human getting lost in the Pokemon world and having to team up with various Pokemon to find their way back home. Or perhaps a story about a human who discovers they have the power to transform into a Pokemon.
Friendship is a very common theme. The idea of a human and a feral pokemon overcoming their differences to become friends is often explored. For example, they might start off as wary of each other but gradually learn to trust.
One popular 'human turned pokemon x harem fanfic' is 'A New World, A New Me'. It has an interesting plot where the main character, who turns into a pokemon, has various interactions with different pokemon characters in a harem - like setting. The story is well - written with a good balance of adventure and character development.
The male OC human might be on a quest in 2018, and the female Pokemon could be his guide. She could lead him through the Pokemon universe, showing him secret places and teaching him about the history of the Pokemon world.
First, you need to come up with your main characters. Decide if your human character will be a trainer, a scientist, or something else. For the Pokemon, choose its type and characteristics. Then, think of the setting. Is it in the traditional Pokemon regions or a new, made - up place? After that, create a basic plot, like a quest to find a missing Pokemon or to stop an evil organization.