Well, it might be that Blue Oak is a character who has a rivalry with the main protagonist in the Red Pokemon fanfic. They could compete in Pokemon battles, and Blue Oak's unique strategies and Pokemon team could be a central focus. For example, he might have a team of Pokemon with special abilities that are not commonly seen in the regular Pokemon games, which makes his battles really exciting to read about.
Blue Oak might be a healer in the fanfic. With his knowledge of Pokemon, he could heal injured Red Pokemon. This role would bring a different aspect to the story as he could also form bonds with the Pokemon he heals, and maybe some of these healed Pokemon end up joining his team or helping him in other ways later in the story.
I haven't actually read this particular fanfic yet. But if it's about Pokemon Special and involves Oak, Green or Blue, and a bird Pokemon, it could be really interesting. It might explore unique storylines like the relationship between the characters and the bird Pokemon, or perhaps some new adventures in the Pokemon Special world.
Red and Blue themselves are often popular characters. Their rivalry and different approaches to Pokemon training can make for great stories. Also, Professor Oak is a well - liked character as he often plays an important role in the fanfic, like giving advice or providing new Pokemon to trainers.
The character dynamics in these fanfics are really special. Red and Blue are well - known characters from the original games. When they are placed in the Alola region, their relationships with each other and with new characters they meet are full of potential. For example, they might have to team up with local trainers to face a common threat, which shows how their different training philosophies can either clash or complement each other. And the fanfics can also explore how they view the new Alola Pokemon compared to their familiar Kanto Pokemon.
One interesting storyline could be about a trainer who catches a rare Pokemon in the Red and Blue regions and has to protect it from an evil team. Another could be a story of two rival trainers from the Red and Blue versions who end up having to team up to save the Pokemon world.
It could be about Green or Blue obtaining a rare bird Pokemon and Oak helping them train it. For example, they might discover a shiny Pidgeot and Oak gives them tips on how to make it the strongest it can be.
It can expand on the lore by delving deeper into Blue Oak's character. Maybe it reveals his backstory, like his family life or how he got into Pokemon training. It can also introduce new Pokemon species or variants that are unique to the fanfiction world.
One popular theme is the relationship between the protagonist and Blue Oak. It could be a friendship that develops through their Pokemon adventures. Another theme might be the exploration of different Pokemon regions in the context of the fanfiction. And sometimes, there are themes related to the evolution of Pokemon in unique ways that are not in the original games.
I think a 'pokemon green x blue fanfic' might explore the relationship between the Pokemon from the Green and Blue versions. It could involve new adventures, battles, or even unique Pokemon combinations that are specific to the lore of those two versions.