One interesting idea could be a crossover with a fantasy world like Middle - earth. Pokémon could interact with hobbits, elves, and dwarves. For example, Pikachu might befriend a hobbit and help them on an adventure. Another idea is a crossover with a superhero universe. Pokémon trainers could team up with superheroes to fight supervillains. And a crossover with a historical setting, like ancient Rome, where Pokémon battles are part of the gladiator games.
One interesting crossover could be the characters from Undertale finding themselves in the Pokemon world. For example, Sans could be wandering around the Kanto region, interacting with Pokemon trainers. He might use his unique abilities in battles against Gym Leaders. Another could be Frisk trying to catch Pokemon, but with their pacifist nature, they might have a different approach to Pokemon training, like befriending them without battling.
One interesting crossover could be a battle between Goku and a powerful Pokemon like Mewtwo. Goku's martial arts skills against Mewtwo's psychic powers would make for an epic showdown. Another could be Goku training with Pokemon to increase his speed and agility. For example, he might train with Pikachu to learn quick dodging techniques.
Well, in Danganronpa and Pokemon fanfiction, there might be a scenario where the Danganronpa students are transferred to the Pokemon world. They could then use Pokemon to solve the mysteries that occur there. Some students might be good at training certain types of Pokemon based on their personalities. Like Byakuya would probably have some rare and powerful Pokemon, like a Dragonite perhaps, as it suits his status - obsessed personality.
One idea could be a crossover with the Powerpuff Girls. Ben could team up with the girls to fight a common enemy that is causing chaos in both their universes. Another could be a crossover with the Teen Titans. Ben's alien forms and the Titans' powers would make for some epic battles and cool team - up moments.
One idea could be an Overwatch crossover with the Star Wars universe. Imagine Tracer using her time - jumping ability in the middle of a lightsaber duel on Tatooine. Another could be a crossover with the Harry Potter world, where Winston, being the intelligent gorilla, might be intrigued by the magic at Hogwarts and try to study it. And a crossover with the Lord of the Rings, with Reinhardt as a valiant knight facing off against Orcs in Middle - earth.
A great marvel crossovers fanfiction idea is to cross over the Guardians of the Galaxy with the Fantastic Four. The Guardians' intergalactic adventures meeting the scientific minds of the Fantastic Four would be full of potential. You could have Rocket Raccoon and Mister Fantastic sharing their tech knowledge, or Groot and The Thing having a friendly brawl. It would be a fun mix of different universes within the Marvel world.
One idea could be a Twilight crossover with Harry Potter. Picture Bella as a witch who somehow ends up at Hogwarts. Another could be a crossover with The Hunger Games, where the vampires and werewolves have to participate in the Games. Or a crossover with Supernatural, with the Twilight characters getting involved in hunting supernatural beings.
A great Zootopia crossover fanfiction idea is with the world of Avatar. The animals could visit Pandora and interact with the Na'vi. The Na'vi might be fascinated by the talking animals from Zootopia. Or a crossover with the Incredibles. The super - powered family could team up with Judy and Nick to solve a crime in Zootopia that involves some super - villainous animal. Also, a crossover with Toy Story where the Zootopia toys come to life and have their own adventures within the city would be really fun.
One interesting crossover could be Ash and his Pokemon traveling to the Naruto universe and having to deal with the ninja world's challenges. Maybe Pikachu uses its electric attacks against ninja techniques.
Another idea in pokemon and harry potter fanfiction could be the sorting of Pokemon into Hogwarts houses. Some Pokemon, like Bulbasaur, with its calm and studious nature, might be sorted into Ravenclaw. While Pokemon like Charizard, which are brave and strong - willed, could end up in Gryffindor. This concept can lead to really creative stories about how Pokemon interact within the Hogwarts house system.