One idea is that there is a prophecy in the Warrior Cats' world about strange, colorful beasts (the Pokemon) that will bring either great destruction or salvation. A group of brave Warrior Cats set out to find these beasts. When they meet the Pokemon, they find that some of them are very friendly, like Eevee. However, there are also some that are more aggressive, like Tyranitar. The Warrior Cats have to figure out which Pokemon are good and which are bad, and work with the good ones to save their world from a mysterious dark force that is awakening.
Well, perhaps a plot where a trainer is exploring a strange new area and somehow crosses into the Warrior Cats' world. The trainer's Pokemon have unique abilities that the Warrior Cats have never seen. For example, a Charizard could help the Warrior Cats during a forest fire by using its fire - breathing ability in a controlled way. In return, the Warrior Cats teach the Pokemon and the trainer about their way of life, like hunting and stealth. As they interact more, they learn to respect each other's differences and strengths.
The Pokemon might use their powers to help the Warrior Cats. For example, a Water - type Pokemon could create a water source during a drought. The Warrior Cats, in turn, could teach the Pokemon about survival in the wild without trainers. They could share their hunting skills with Pokemon like Growlithe, which might be interested in learning new ways to catch prey.
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.
One possible plot could be that Sonic and his friends accidentally end up in the Pokemon world. They team up with some Pokemon trainers to stop an evil villain who is trying to use chaos emeralds and powerful Pokemon to take over both the Sonic universe and the Pokemon world. Sonic's speed could be used in Pokemon battles, like quickly dodging attacks or getting to strategic positions on the battlefield.
One idea could be a story about a young cat who is born with a unique power in the warrior cats world, like the ability to communicate with other animals. This cat could struggle to fit in with the traditional ways of the clans but eventually use their power to save the clans from a great danger. For example, they might be able to understand the warning signs from the birds about an approaching flood or a group of hostile foxes. Another plot could be a forbidden love story between two cats from rival clans. They would have to keep their relationship a secret while also trying to find a way to bring peace between their clans.
One idea could be that the characters from Bnha are transported to the Warrior Cats world. For example, Deku could find himself in a Clan and have to learn the ways of the cats to survive. He might use his quirk in unique ways to help the Clan, like using One For All to jump really high to catch prey or to defend against other Clans.
One interesting plot could be that the Pokemons are suddenly exposed to the energy of the Dragon Balls. Some Pokemons start to gain Saiyan - like abilities. For example, Pikachu could become Super Saiyan Pikachu, with its electric powers amplified to an extreme level. It could then face off against powerful Pokemon villains in a whole new way, with the fast - paced combat style of Dragonball Z.
Maybe in this crossover, some Pokemon are accidentally sent to Danny's world. Danny has to protect the Pokemon from being captured by the Guys in White while also trying to find a way to send them back. Meanwhile, a certain Pokemon, like Gengar, forms a special bond with Danny because of their shared ghostly nature.