One interesting plot idea could be that Groudon and Kyogre are forced to team up against a new, greater threat that endangers their respective habitats. Maybe a powerful alien - like Pokemon arrives on Earth and starts draining the oceans and drying up the land simultaneously. Another idea is a story where a young trainer has the ability to communicate with both Groudon and Kyogre and tries to broker peace between them, as their eternal struggle is causing chaos for the people and other Pokemon. Or perhaps a plot where Groudon and Kyogre discover they are part of an ancient prophecy and must combine their powers in a specific way to save the world from a cataclysmic event.
A plot could also revolve around a new type of power - enhancing crystal that has been discovered. Kyogre and Groudon both want it to boost their own strength. A group of trainers get caught in the middle of their struggle. They have to figure out a way to either stop the two Legendary Pokemon from fighting over it or find a way to share the crystal's power between them to maintain the balance in the world.
One idea could be that Groudon and Kyogre are forced to team up against a new, greater threat that endangers the entire Pokemon world. This could be a powerful, ancient Pokemon that has been awakened. Another plot could be a story where a trainer tries to understand the relationship between Groudon and Kyogre through a series of dreams and adventures, and in the process, discovers a hidden power that lies within their connection.
For Kyogre, it could be characterized as a powerful but somewhat solitary being. It's protective of the oceans and views any threat to the seas as a direct attack. It's majestic and its movements are fluid like the waves. Groudon, on the other hand, is a force of the land. It's stubborn and proud, believing that the land is the most important part of the world. It's slow to trust but once it does, it's a loyal ally.
In a fanfic, Groudon can be seen as a proud and territorial being. Since it represents the land, it guards its territory fiercely. It has a sense of honor and dignity associated with its role as the keeper of the earth. Kyogre can be characterized as a wise and ancient entity. It has seen the ebb and flow of countless years beneath the ocean waves. It is patient but when provoked, it can call upon the power of the entire ocean to defend itself. They both can be shown as having a mutual respect for each other's power deep down, even though their natures often put them at odds.
Well, it could be about their eternal struggle in a new light. Maybe in a world where they have to team up against a greater threat. For example, a new powerful Pokemon that is causing chaos in their shared ecosystem. Their powers combined could create a unique dynamic.
The potential for unique relationships. They can be rivals, but also in some fanfics, they become friends or even more. Their relationship can be explored in many different ways, like in some fanfics where they learn to understand each other's importance in the Pokémon ecosystem.
A great fanfiction idea could be a time - travel story involving Groudon and Kyogre. A trainer travels back in time to the era when Groudon and Kyogre first started their feud. The trainer tries to prevent the feud from ever starting, but in doing so, he accidentally disrupts the balance of nature in that time period, leading to new and unexpected challenges.
I'm not sure specifically as I haven't read that exact fanfic. But generally, a fanfic about Groudon and Kyogre might explore their relationship in the Pokemon universe. It could be about their battles, their coexistence, or some fictional scenarios where they interact in unique ways.
One possible scenario in a Groudon and Kyogre fanfiction could be a story where they are forced to team up against a greater threat. Maybe a new, extremely powerful Pokemon emerges that threatens to destroy their habitats. Groudon, the land Pokemon, and Kyogre, the sea Pokemon, must put aside their age - old rivalry to save the world they both call home.
There might be a story where Kyogre and Groudon are forced to work together. They start off as enemies but as the story progresses, they learn to respect each other's strengths. For example, Kyogre's control over water helps put out fires caused by Groudon's volcanic activities, and in return, Groudon provides land for Kyogre's sea creatures to rest on during low tides. This shows their growth from antagonists to allies in the fanfiction world.