A fanfiction could depict a scenario where Ash is training in a secluded area and suddenly a portal opens up and out comes the Dark Magician Girl. She is being chased by some dark forces from her world. Ash, without hesitation, offers his help. He calls upon his strongest Pokemon to protect her. As they hide from the pursuers, they start to communicate. The Dark Magician Girl is amazed by the Pokemon and Ash is intrigued by her magic. They then come up with a plan to defeat the dark forces once and for all. Ash's Pokemon use their unique moves and the Dark Magician Girl uses her powerful spells to drive away the enemies, forging a strong bond between them in the process.
One possible story could be that Ash stumbles upon a magical portal during one of his Pokemon adventures and ends up in the world where the Dark Magician Girl exists. He teams up with her to face a common enemy that threatens both the Pokemon world and her magical realm. They learn from each other's skills and strategies, with Ash teaching her about the bond between trainers and Pokemon, and she shows him some of her powerful magic spells.
A simple fanfiction could be that Chespin and Fennekin are forced to work together in a Pokemon rescue mission. They initially don't get along due to their different natures, but as they face challenges like rescuing trapped Pokemon from a collapsing cave, they start to understand each other's strengths. For example, Chespin can dig through rubble with its sharp claws and Fennekin can light up the dark areas with its flames.
Maybe in a fanfiction, Pikachu and Fennekin find themselves in a strange, magical forest. They have to rely on each other to find their way out. Pikachu's ability to sense electricity in the air helps them avoid dangerous areas, and Fennekin's sense of smell leads them to sources of food. Their journey through the forest strengthens their bond.
They could be in a fanfiction where they are forced to work together against a common enemy like a powerful trainer who wants to capture them both. Pikachu's speed and strong electric attacks combined with Pachirisu's cute charm and quick thinking can make for an interesting dynamic.
A simple fanfiction could be that Greninja and Delphox are forced to be allies when their trainers are kidnapped by an evil organization. They have to put aside their differences and work together to rescue their trainers. Greninja uses its agility to scout the enemy base, while Delphox uses its fire attacks to create distractions.
In a more complex fanfiction, Lucario and Gardevoir are from different social groups within the Pokemon world. Lucario is part of a group that values strength and combat, while Gardevoir is from a more peaceful, psychic - centered group. When a mysterious force starts to disrupt the balance between these groups, they are forced to work together. At first, they have a hard time understanding each other's ways, but as they face challenges like rescuing kidnapped Pokemon from the mysterious force, they learn to appreciate each other's strengths and ultimately bring peace between their groups.
Bayleef and Latias make for an interesting pair in a fanfic. They could start as unlikely allies. Maybe Bayleef is initially afraid of Latias because of her dragon - like appearance and psychic powers. But as they are forced to work together to solve a mystery in their Pokemon world, like the disappearance of a certain type of Pokemon, they gradually start to trust each other.
The Dark Magician is often depicted as a powerful and wise figure. He is highly skilled in magic and is a mentor - like character in some fanfictions.
One possibility in Tinkerbell - Vidia fanfiction is that they form an unlikely alliance. Vidia, known for her independence, might find herself in a situation where she needs Tinkerbell's help. For instance, if she gets trapped in a part of the forest she's not familiar with and Tinkerbell uses her tinkering skills to free her. This could be the start of a new friendship.
They could be unlikely allies in a fanfiction. Agent 8, being new to the scene, might initially be distrusted by Agent 3. But as they face a common enemy, they start to work together. For instance, a powerful foe emerges that neither can defeat alone.