Well, perhaps the story starts with Ash arriving in Unova and immediately stumbling upon a Gible. Gible could be lost or in some kind of trouble. Ash, being Ash, decides to help it. As they interact, Gible takes a liking to Ash and wants to join his team. Ash then has to figure out how to train Gible in the Unova region, which has different Pokémon and training styles compared to other regions he has been to. They might enter local tournaments together and slowly build a reputation in Unova as a formidable trainer - Pokémon duo.
There might be a girl trainer who is very skilled in battling but has a shy personality. She initially challenges Ash to a battle and after that, they realize they have a lot in common. They start sharing tips about Pokemon training and soon become friends. This friendship could then lead to various adventures together as Ash explores Unova.
One idea could be Ash starting in Unova with a new set of Pokemon he catches right away. Maybe he meets a unique and rare Pokemon that no one has seen before in that region. Another could be that he has to face a new type of villainous team that has different motives compared to the ones in other regions.
In Unova - based fanfiction, if Ash gets involved with dragons, it could be an amazing story. Maybe he befriends a baby dragon Pokémon that has been separated from its family. Ash then has to protect it from poachers or other dangerous Pokémon. Along the way, he forms a strong bond with the dragon, and this bond could change his approach to Pokémon training completely. He might start to focus more on the emotional connection with his Pokémon rather than just battle strategies.
Ash could become more patient. Since Gible might be a bit difficult to train at first, Ash has to learn to be patient with it. He might also become more adaptable as he has to adjust to the Unova region's unique Pokémon and training methods while training Gible.
One possible scenario in this fanfiction could be that Ash has to overcome his toughest opponents yet in Unova. He might face trainers with unique and powerful Pokémon that he has never encountered before. His Pikachu would surely play a crucial role, using its speed and electric attacks to outwit opponents.
In Unova fanfiction, one difference in Ash could be his relationships. He might have more complex friendships or rivalries compared to the main series. For example, his bond with his Pokémon could be explored in greater depth, like how he trains and communicates with them on a more emotional level.
In this fanfiction, Ash and Dawn's adventures in Unova could be filled with new Pokemon encounters. Ash might bring his typical enthusiasm and determination, while Dawn could add her own unique charm and Contest skills. They could team up to face new challenges, like strong Gym Leaders in Unova. Their friendship would also likely develop further as they explore this new region together.
In a fanfiction of Ash in the Unova League, it could focus on his relationships with his Pokemon during this journey. Maybe Pikachu has a special moment of growth, or he catches a new and rare Pokemon that becomes crucial in his battles in the league.
In fanfiction, Ash in Unova might get the chance to ride a dragon - type Pokémon. This would be an incredible experience for him. It could also open up new areas for him to explore in the Unova region, areas that are only accessible by air or with the help of such powerful Pokémon.