One idea could be that Ash and Ursula team up for a special Pokemon tournament. They start off as rivals but gradually develop a deep friendship that might turn into something more. Ursula's unique Pokemon training techniques could complement Ash's own style.
A great plot could be that Ursula has a personal mission to save a certain Pokemon species. Ash, being the kind - hearted trainer he is, joins her. Along the way, they learn more about each other's pasts and dreams. Their interactions with different Pokemon and trainers during this mission bring them closer, and they realize they have feelings for each other.
Well, one idea is that Dawn and Ursula accidentally swap Pokemon for a day. This leads to all sorts of chaos as they try to adapt to each other's Pokemon teams. They could also be in a situation where a new type of Pokemon evolution is discovered, and they both have different ideas on how to handle it. Their conflicting ideas cause a rift at first, but then they realize they can collaborate. Another plot might be that a magical Pokemon event causes them to enter a parallel dimension where they have to rely on each other completely to get back to their own world.
Perhaps a plot where Zoey gets lost in an unknown region and Ash goes to find her. Along the journey, they discover new Pokemon species and have to work together to survive. This would create a sense of adventure and build their relationship.
One idea could be that Sawyer and Ash team up for a special Pokemon tournament. They start off as rivals but gradually learn to respect and support each other. Another could be that they go on an adventure to discover a new and rare Pokemon species in a far - off region. Sawyer might initially be skeptical of Ash's methods but in the end, they both benefit from the experience.
One idea could be Ash getting transported into the world of Pokemon Red. He could meet the original Red and they team up to face a new, powerful villain. Maybe a mysterious Pokemon that has powers beyond any they've seen before.
In some fanfictions, Ash and Red might have a friendly rivalry. For example, they could hold a series of Pokemon battles across different terrains to see who is the better trainer. This could involve a lot of training montages for their Pokemon, strategizing about type advantages, and some really exciting battle scenes.
Maybe in the fanfiction, Ash and Gray get lost in an unknown region while on a journey. They must rely on each other and their Pokemon to find their way back. Along the way, they discover a new type of Pokemon and have to figure out how to deal with it. This could lead to some great character development for both of them as they face challenges together.
One idea could be that Mewtwo and Ash are forced to team up to save the Pokemon world from a new, powerful and evil threat. They start off distrusting each other due to their differences, but as they face challenges together, they begin to understand and respect one another.
One plot idea could be that Ash's OC partner has a unique ability to communicate with legendary Pokemon. This ability draws the attention of Team Rocket, who try to capture the OC to use their power for evil. Another idea is that the OC is from a far - off region and has a different approach to Pokemon training, which challenges Ash's traditional methods and they learn from each other. A third idea could be that the OC has a mysterious past related to a powerful and lost Pokemon species, and Ash and the OC embark on a journey to discover the truth about it.
One idea could be that Ash discovers a wounded Mewtwo and nurses it back to health. As they spend time together, they form an unbreakable bond that challenges the way both Pokemon and humans interact. Another plot could involve Mewtwo using its powers to help Ash reach a new level of Pokemon training. For example, it could allow Ash to experience telepathic communication with his Pokemon, enhancing their battle strategies.
One interesting storyline could be that Ursula tries to steal Ash's Pikachu for her own collection. She might use her wits and some devious Pokemon to outsmart Ash. Another could be Ash and Ursula teaming up by accident to face a common enemy that threatens both of their goals. For example, a powerful and rogue Legendary Pokemon.