Well, in the 'Legendaries' fanfiction, Ash may be rewarded by having Legendary Pokémon offer to train him. You know, Legendary Pokémon possess incredible power and knowledge. If they were to train Ash, he could learn new battle strategies, gain better control over his Pokémon, and even develop a new understanding of the Pokémon world. This type of reward would significantly enhance his skills and reputation in the Pokémon universe.
One popular 'ash has legendaries' fanfiction could be about Ash forming a deep bond with a legendary Pokémon like Mewtwo. In this story, Ash might help Mewtwo understand the true meaning of friendship and together they face off against powerful villains who are after Mewtwo's power.
Well, in the world of fanfiction, 'ash master of legendaries' could potentially involve Ash having unique abilities or experiences related to legendary Pokémon. Maybe he has the power to communicate with them, train them in ways no one else can, or he's on a special quest involving legendaries. It could also explore his relationships with other trainers in this new role as a'master of legendaries'.
You can try looking on fanfiction websites such as FanFiction.net. There are tons of Pokémon - related fanfictions there, and you should be able to find some that are about Ash having legendaries by using the search function.
Ash is surely a main character. He's probably joined by his Pokémon pals, like Pikachu. There could also be other trainers who are either friends or rivals. Maybe some of the legendary Pokémon themselves could be considered main characters in a way, as they would play important roles in Ash's story of becoming a master of legendaries. They might have their own personalities and motives that interact with Ash's goals.
In fanfiction, the idea of Ash being rewarded by the legendaries can have multiple interpretations. It might be a way for the author to deviate from the normal Pokémon storyline and give Ash an edge. This reward could be something as simple as a new form for one of his Pokémon, or as complex as a prophecy being fulfilled where Ash is now the chosen one with special privileges. The legendaries, being powerful and mysterious, might see Ash's potential and decide to bestow upon him something that will change his destiny in the Pokémon world.
Ash might be rewarded with a special place in the Legendary Pokémon's domain. It could be like a secret area where he can rest, train his Pokémon in a unique environment, and gain access to resources not available elsewhere. This would be a great advantage for his journey.
There's a fanfiction called 'Ash and the Legendary Allies'. In it, Ash accidentally stumbles upon a secret place where legendaries live. He befriends them, starting with Articuno. As the story progresses, he teams up with different legendaries to save the Pokemon world from a new and powerful threat. It's really exciting as it combines Ash's usual tenacity with the extraordinary powers of the legendaries.