I read a lot of Pokemon fics, and the Scott/Dawn tag has a certain flavor. The big conflict tends to hinge on the secrecy of their feelings because of their roles—he's a frontier brain, a champion-level figure, and she's a top coordinator traveling the region. So you get these plots where they're constantly missing each other due to schedules, or they have to keep things quiet to avoid media frenzy messing with Dawn's brand or Scott's business with the Battle Frontier. There's also the classic 'they're both too focused on their careers to admit they want something else' angle.
I've seen a few that dig into the age gap, not just in years but in life stages—he's settled into running this established facility, she's still in the thick of her journey, and that creates friction about where a relationship could even fit. Some writers use the 'Ash factor' too, with Dawn's long-time travel partner maybe feeling protective or Scott being vaguely jealous of that unbreakable bond, even though it's purely platonic.
The best ones, though, don't invent external drama. They make the conflict about internal doubts. Scott wondering if he's holding her back from a brighter spotlight, Dawn wrestling with whether settling down in any sense means giving up on her dreams. It feels more genuine than a random villain plot.