Perhaps aah takes his best team to Sinoh in the fanfiction to train. Sinoh could have some unique training facilities or environments. They might also encounter some rare and powerful Pokémon there that could help them become even stronger as a team. They could learn new battle techniques and improve their teamwork skills during their time in Sinoh.
In the fanfiction, aah's best team might consist of trainers with diverse skills. For example, one could be an expert in stealth and scouting, which would be useful for exploring Sinoh. Another could be a healer who can take care of the Pokémon's injuries quickly, ensuring the team can keep going strong during their adventures in Sinoh.
It's possible that as he takes his seat, he feels a strange sense of unease. This could be a sign that something dangerous or magical is about to happen. Maybe there's a hidden spell on the seat, or there's a plot against him by some of the dark wizards who have infiltrated Hogwarts.
His closest allies like Batman or Batgirl could be present. They might be the ones he trusts enough to show his face to.
In fanfiction, when Team Flash meets Team Arrow, there could be an exchange of superpowers knowledge. The Flash's speedster abilities might amaze the members of Team Arrow, while the archery and combat skills of Team Arrow could be something new for Team Flash to learn from. Maybe they would team up to fight a common and extremely powerful villain that neither team could handle alone.
Kakashi might use his Sharingan to quickly assess Naruto's condition. He could then take the necessary steps to heal him, like getting the right medicine or using some basic medical ninjutsu if he knows any.
Well, she might show off her amazing combat skills. Maybe she'll teach the team some new fighting techniques or strategies.
In this kind of fanfiction, Ash and Charizard might encounter new Pokémon in Unova that they've never seen before. Charizard could have some really cool battles against Unova - native Pokémon. Maybe it would also meet some new friends or rivals. And Ash could learn new training techniques from the trainers in Unova to further improve Charizard's skills.
In fanfiction, Ash and Greninja might have all kinds of adventures in Alola. They could encounter new Pokémon species that are unique to Alola. Greninja could show off its skills in the new environment, impressing the local trainers. Maybe they'll participate in the Alola Pokémon League together and face strong opponents.
In fanfiction, when Ash takes Charizard to Alola, they might have all kinds of adventures. Charizard could help Ash in battles against the unique Alola Pokémon. It could also be a chance for Charizard to interact with new Pokémon species and form new friendships or rivalries. Maybe it would even learn some new moves from the local Pokémon trainers or from the environment of Alola.
In the fanfiction, Robin might reveal a secret identity or a hidden face with a unique scar or mark. It could also lead to a moment of great vulnerability, where his friends see a side of him they never expected.