It's completely unacceptable. Pokémon is a beloved brand known for its adventure, friendship, and positive values. Creating sexual fanfic about Pokémon is not only disrespectful to the original concept but also can be considered as a form of inappropriate and unethical behavior that can make many fans uncomfortable.
One popular Pokemon x Pokemon fanfic could be those that focus on the friendship between Pikachu and Eevee. They are both very popular Pokemon, and a fanfic might explore their adventures in a new region. Another could be about a trainer's journey with a Charizard and a Blastoise, showing how they cooperate and compete at the same time.
The story of Pokemon X can last anywhere from 15 to 35 hours. If you rush through the main plot, it'll be on the shorter end. But if you take your time, do side quests, and explore thoroughly, it could be longer.
Pikachu is a must - include. It's Ash's most iconic Pokemon. For Sawyer, his Slurpuff could be great. Also, Greninja for Ash would add a lot of action scenes. Sawyer's Sceptile could also be interesting to include as it can show the different training styles between them.
One concept could be a story about Pikachu and Eevee. Maybe they go on an adventure together in a region filled with rare berries and have to overcome various obstacles. For example, they might face a team of rogue Pokemon that are trying to steal all the berries. Another concept could involve Charmander and Squirtle. They could be in a competition to see who can reach a powerful water or fire stone first, but along the way, they learn to respect each other's strengths and weaknesses.
One popular one might be those that explore unique adventures of Ash with his Pokemon in a more creative and unexpected way. For example, some fanfictions could focus on Ash and Pikachu having a special bond that leads them to discover a new, mysterious part of the Pokemon world.
One idea could be a hybrid of Pikachu and Eevee. This hybrid could have the cute appearance of both, with Pikachu's lightning - based powers combined with Eevee's ability to evolve into different forms. It could be a central character in a story where it's trying to find its place in the Pokemon world, being different from the normal Pokemon.
First, decide on the Pokemon you want to feature. It could be your favorite ones or ones that you think would have an interesting dynamic. For example, a mischievous Meowth and a serious Squirtle. Then, come up with a basic plot. Maybe they get lost in an unknown forest and have to find their way back while facing various obstacles.
Love and attraction can sometimes be a theme as well, though not always in a romantic way. It could be more about admiration and respect for each other's skills as pokemon trainers. For example, the female character might admire Ash's determination, and Ash might be impressed by her unique training methods.
For a Pokemon x Pokemon hybrid fanfiction, you could consider a Bulbasaur and Vulpix hybrid. It would have the plant - based abilities of Bulbasaur like photosynthesis and the fire - based powers of Vulpix. It could use the fire to protect its plants or use the plants to create a unique defense against other fire - types. Also, a hybrid of Jigglypuff and Meowth could be really fun. It might have Jigglypuff's singing ability to put others to sleep and Meowth's thieving skills, which could lead to some really comical and interesting plotlines.