There could be many. Some fanfiction authors might create a special tournament arc where Ash has to use all his Pokémon to win. Or a situation where he's in a strange new region with unique challenges that require him to call upon every Pokémon he has in the fan - created story.
Yes, in some adventure - based fanfiction. For instance, if Ash is exploring a dangerous, uncharted territory filled with powerful and mysterious Pokémon. The author might write it so that he has to use all his Pokémon's different skills and abilities to survive and progress. Each Pokémon could play a crucial role, like one for flying over obstacles, another for using a specific type of attack against certain Pokémon they encounter. This makes for an exciting and engaging fan - made story.
It could mean that Ash, in the context of fan - created Pokémon stories (fanfiction), utilizes all the Pokémon available to him within those fictional narratives. For example, he might use different Pokémon for various battles, quests or adventures as written by the fanfiction authors.
It could be Pikachu. Since Pikachu has been with Ash from the very beginning and is his most iconic Pokémon. It's very likely that in Sinnoh fanfiction, Pikachu would be frequently used as it has a strong bond with Ash and is also very powerful.
He was probably devastated. Ash had such a strong bond with his Pokémon. Losing them would be like losing part of himself. He might have initially been in shock, unable to believe what had happened.
At first, his Pokémon would be startled. They've always known Ash as a human. But then, they would start to adapt. Some Pokémon, like Squirtle, might try to play with Ash in his new form, thinking it's a new kind of game. However, his more loyal Pokémon, like Greninja, would be determined to find a way to turn Ash back. Greninja might use its special bond with Ash to try and communicate with him on a deeper level in this new form, to understand what happened and how to reverse it.
In many fanfictions, Ash is indeed portrayed as having all the legendary Pokémon. This can add an exciting twist to the Pokémon universe. It allows for the exploration of different relationships between Ash and these extremely powerful creatures. For instance, he could use their combined powers to face off against a new, even more menacing threat. It also gives a chance to see how the Pokémon world would react to someone having such an extraordinary collection. Some fanfictions might even have Ash use the knowledge and abilities of the legendaries to teach other trainers or to make the Pokémon world a better place in terms of understanding different species better.
In a lot of fanfiction, Ash is indeed portrayed as the one who saves all legendary Pokémon. This concept can be really thrilling for fans. Imagine Ash, with his Pikachu by his side, facing all kinds of challenges and foes to rescue these powerful and often mysterious Pokémon. It gives a sense of epic adventure. Also, it can be a way for writers to explore different aspects of the Pokémon lore and the relationships between different legendary Pokémon and Ash. It makes for some very engaging reading, but again, there are also fanfictions that deviate from this idea.
Well, Ash and his Pokémon might get involved in local Alola festivals. His Pokémon could participate in Pokémon - themed contests or challenges during these festivals. Also, they might team up with local trainers and their Pokémon to protect Alola from any potential threats, like a group of wild Pokémon causing chaos in a village.
Ash probably uses creative training methods in the fanfiction. For example, he might have his Pokémon practice moves in tandem with each other. Pikachu and Charizard could work together on a combo move, which not only strengthens their individual skills but also their ability to cooperate in battles.
Sure. Fanfiction writers like to play with the idea of Ash having this special ability. It makes for some great plotlines. For example, he could understand his Pokémon's fears or desires better and act accordingly. It also gives a chance to show how the Pokémon might think and feel about different situations in a more in - depth way.
Some of his Pokémon might be confused. Pokémon like Pikachu, who has a very close bond with Ash, would initially be in shock. Pikachu would likely try to understand why Ash is doing what he's doing and might even try to stop him at first.