What could be an interesting plot for a sonic and pokemon crossover fanfiction?

Maybe Sonic discovers a chaos emerald has the power to transform Pokemon into super - powered versions, similar to Mega Evolutions. He has to work with Pokemon trainers to make sure this power doesn't fall into the wrong hands. The chaos emeralds' energy could also attract Legendary Pokemon, leading to some epic battles and adventures.

One possible plot could be that an ancient evil threatens both the Sonic X universe and the Sonic Boom universe simultaneously. Sonic from Sonic X and Sonic from Sonic Boom have to team up, along with their respective friends. They could start by accidentally crossing into each other's worlds through some sort of interdimensional rift. At first, they might be a bit confused and even a little competitive, but as they realize the scale of the threat, they combine their unique skills. Sonic X's Sonic is more used to high - tech environments and has different power - ups, while Sonic Boom's Sonic is more in tune with his natural island surroundings. Together, they could battle the evil and in the process, learn a lot from each other and their friends, ultimately saving both universes.

One possible plot could be that an evil force is threatening both Kirby's and Sonic's worlds. They accidentally cross paths while investigating strange happenings. Kirby can use his ability to copy powers and Sonic can use his speed to explore different areas. Together, they combine their skills to defeat the common enemy. For example, Kirby might copy Sonic's speed ability for a short time, allowing him to quickly reach parts of the battlefield that Sonic couldn't access alone. And Sonic could use Kirby's star power to enhance his own attacks.

One possible plot could be that Sonic accidentally runs through a portal and ends up in the Naruto universe. He meets Naruto and his friends, and they initially mistake him for some kind of strange summon. Sonic's speed could be a great asset in battles against the Akatsuki. For example, he could quickly retrieve intel or rescue hostages. And Naruto could teach Sonic about the power of friendship and determination in a different way than he's used to in his own world.

One possible plot could be Sonic accidentally running into the Pokemon world while chasing Dr. Eggman through a strange portal. He teams up with Pikachu to stop Eggman from stealing all the Pokeballs in a Pokemon center. Sonic's speed and Pikachu's electric attacks would make a great combo against Eggman's robots.

One possible plot could be that Sonic somehow gets transported to the Naruto universe. He teams up with Naruto to stop an evil force that is using both chaos emeralds and ninja jutsu to create chaos. Sonic's speed could be a great asset in the battles, and Naruto's determination and jutsu would also contribute a lot.

One interesting plot could be that Ben, using his Omnitrix, accidentally lands in the Pokemon world. He teams up with Ash and Pikachu to stop an evil organization that is trying to use both Pokemon and alien technology. For example, they might be creating hybrid creatures using Pokemon DNA and alien powers. Ben's different alien forms could have unique interactions with the Pokemon. His Four Arms form could be really strong in Pokemon battles, while his XLR8 form could be used to quickly traverse the Pokemon world to reach different areas in time to stop the villains.

One possible plot could be a trainer in the Pokemon world discovers a strange worm - like Pokemon that has abilities never seen before. This Pokemon could be a key to unlocking a hidden power within the region that an evil team is also after. The trainer has to protect the worm - like Pokemon and use its unique powers to defeat the bad guys.

One possible plot could be that Mario and Luigi are exploring a new world and accidentally stumble upon the Pokemon world. They team up with Ash and Pikachu to stop Bowser who has teamed up with Team Rocket to steal all the Pokeballs and use the Pokemon's power to take over both the Mushroom Kingdom and the Pokemon world.

Maybe there's a villain in the Pokemon world who is using some kind of Pokemon - related power to cause chaos, similar to the villains in BNHA. The heroes from BNHA have to team up with local Pokemon trainers to stop this threat. They discover new Pokemon abilities that they can incorporate into their own fighting styles. For example, Todoroki could learn from ice - type Pokemon how to better control his ice powers.