Another reason might be differences in their goals. Ash is focused on befriending Pokémon and winning battles in a fair way. His father, on the other hand, could be more interested in power and prestige. This clash of values creates a rift between them, which is manifested in the form of a battle in the fanfiction.
One possible plot could be a battle over different ideologies. Ash might have grown to believe in a more compassionate way of treating Pokémon, while his father could have a more traditional, perhaps harsher view. This could lead to a physical or mental battle as Ash tries to prove his way is right.
One potential father figure for Ash in fanfiction could be Professor Oak. He has been like a mentor and a guiding figure in Ash's life. He has given Ash his first Pokémon and has always been there to offer advice, which could easily be developed into a father - like relationship in fanfiction.
It could be her long - time friend Gary. They've known each other for a long time and there could have been some unspoken feelings between them that led to this situation.
I'm not entirely sure specifically what 'ash battles groundon fanfiction' is about without more context. It could potentially be a fan - made story where a character named Ash is involved in battles in a place called Groundon. Maybe it features Ash's adventures, his strategies in the battles, and how he overcomes various challenges in this fan - created scenario.
He could be an ex - champion who had to give up his title for some noble reason. Now that he meets Ash, he wants to see his son reach the same heights.
One reason could be to create a more complex family history for Ash. It gives his character more depth.
One possible reason could be his father's strict and cold parenting style. Lucius Malfoy was often very controlling, pushing Draco to uphold the family's pure - blood ideals and reputation, which might have made Draco feel suffocated and resentful. Another reason could be that Draco witnessed his father's dark deeds in the wizarding world, like being involved with Voldemort, and he might have moral objections to such actions.
In the fanfiction, Misty catches a Pokemon that has a special ability. Ash, being the competitive trainer he is, challenges her to a battle right away. The battle unfolds in a unique location, perhaps near a waterfall. Ash sends out his Charizard, and Misty uses her newly - caught Pokemon. The clash between fire and water - based attacks creates a spectacular scene.
Maybe in the fanfiction, his friends keep getting in the way of his goals. For example, if Ash is really focused on becoming a Pokémon master and his friends are constantly causing distractions or making him take detours from his training and battles.
One possible reason could be a misunderstanding. For example, if his friends accidentally made a decision that cost Ash a big Pokemon battle or an important opportunity. Another reason might be if there was some sort of betrayal. Maybe one of his friends was secretly working with a rival and Ash found out. But again, these are very uncharacteristic scenarios for the Pokemon world.