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.
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.
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.
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.
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.
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.
Well, in Pokemon journey fanfiction, Alexandria Oak could be an original character. Maybe she's related to Professor Oak in some way. She could be a trainer starting her own journey, facing various challenges and making new friends along the way. For example, she might encounter rare Pokemon or get involved in local Pokemon competitions in the fictional story.
She could have a Bulbasaur. Since she might be related to Professor Oak, it would make sense for her to start with a classic Grass - type like Bulbasaur. It's cute and has great potential in battles as it evolves.
In a Prof Oak fanfic, the mention of blue or green Spearow could be really interesting. Maybe the color difference represents some special abilities or origins. For example, a blue Spearow might be a rare mutant form with enhanced flying speed compared to the regular ones. And a green Spearow could potentially have a closer connection to nature, like being better at finding hidden berries in the forest. However, without reading the specific fanfic, it's hard to say for sure what the significance of these colored Spearow is.