She could have an adventure where she stumbles upon a rare Pokemon egg. She decides to take care of it, not knowing what kind of Pokemon will hatch. As she travels, she faces difficulties in protecting the egg from thieves. Eventually, a shiny Dragonair hatches from the egg, and they form a strong bond.
They could have adventures exploring different realms of heaven. Maybe there are places full of magical creatures they've never seen before. They might be on a quest to find a special kind of magic that can help Harry in some way, even from the afterlife.
They could have an adventure in a mysterious forest. Hypno could use its powers to communicate with the forest Pokemon and find a hidden path that leads to a secret grove filled with rare berries. Serena could then use these berries to make special Pokeblocks for her other Pokemon.
Well, they could embark on an adventure that involves international intrigue. Maybe a valuable artifact has been stolen and is being smuggled across different countries. Sherlock and Hermione would use their combined skills to track it down. Sherlock would use his detective skills to follow the clues on the ground, while Hermione would use her knowledge of different languages and cultures (gleaned from her studies) to help them navigate through different countries and understand the motives behind the theft.
Well, imagine a scenario where a dark force is spreading across both their worlds. Ash and Sakura are chosen to be the ones to stop it. Ash brings his team of Pokemon, and Sakura brings her ninja skills. They travel through different regions, from the lush forests of the Pokemon world to the hidden villages of the Naruto world. Along the way, they meet new characters, some of whom join their cause, and others who try to stop them. They have to learn to work together, with Ash teaching Sakura about Pokemon training and Sakura teaching Ash some basic ninja moves.
One adventure could be them traveling to different magical and non - magical places together. Hermione could take Bella to Hogwarts for a while, and Bella could introduce Hermione to the world of the Volturi. They would face many challenges along the way, like dealing with Hogwarts' strict rules when a non - magical person like Bella is there, and Hermione having to deal with the dangerous vampires in the Volturi's territory.
One adventure could be to stop a group of villains who are stealing magical artifacts to power up high - tech weapons. Hermione would use her magical skills to track down the artifacts and Tony would use his engineering skills to disable the weapons. Along the way, they'd learn from each other and develop a closer bond as siblings.
If Hermione was Oliver's sister in fanfiction, they could have all sorts of adventures. For one, they could team up to investigate strange happenings around Hogwarts that seem to be affecting the Quidditch games. Since Hermione is smart and Oliver is observant in the Quidditch field, they'd make a great team. They might also go on a quest to retrieve a lost Quidditch trophy that has some sort of magical power. And perhaps they'd get involved in a mystery involving a cursed Quidditch broom that is causing trouble for the players. Their combined skills would surely help them solve these problems.
Maybe they'd have to save their family from a common enemy. Since they are siblings in this fanfiction, their family could be in danger from a being that wants to use their combined powers. This would lead them on an adventure through both the wizarding world and the world of Greek gods, having to use Hermione's knowledge of spells and Percy's ability to navigate the world of the gods to keep their family safe.
She could have adventures where she uses her Pokemon to explore new areas in the Fairy Tail world that are too dangerous for normal mages to go alone.
She could have adventures exploring the unique Kalosian landscapes. Maybe she discovers new Pokemon species that are native to Kalos. For example, she might come across a Fletchling in one of the beautiful forests of Kalos and try to befriend it. This could lead to a whole new journey as she learns about the behavior and characteristics of Kalos Pokemon.