In most fanfictions, it's a creative and exciting concept. However, in the official Pokémon lore, it's highly unlikely. But in this particular fanfiction, it could be possible. It depends on how the author has written the story and the rules they've set within that fictional world.
In the world of fanfiction, anything can happen. Regarding 'ash catches all legendary pokemon fanfiction', it could be that the author has created a unique scenario where Ash is able to catch every single legendary Pokémon. This could involve changes to the traditional Pokémon - catching mechanics, or perhaps some kind of overarching plot device that gives Ash an edge. It's all part of the creative license that fanfiction writers have.
One possible plot twist could be that the legendary Pokémon start to lose their powers once caught by Ash. Another could be that there is a hidden cost or consequence to catching all of them that Ash doesn't initially realize.
Yes, in some fanfics Ash might be depicted as getting all the legendary Pokémon. Writers often like to give him these powerful Pokémon to create interesting and unique storylines.
Often, Ash has to complete a quest. In a fanfic with Ho - Oh, Ash might have to find three special feathers scattered across the region. These feathers are said to be the key to summoning Ho - Oh. As he embarks on this journey, he faces many challenges and overcomes them with his existing Pokemon team. Once he collects all the feathers, Ho - Oh appears and, impressed by Ash's determination, decides to fight alongside him. Another way is through a prophetic vision. Ash might have a dream that tells him how to find and bond with a Legendary like Entei, and he follows this vision to make it happen.
I think Salamence would be quite challenging. It's a very powerful and aggressive Pokemon. Ash would need to have a really strong team to weaken it first. Also, its flying ability gives it an advantage in battle, making it hard for Ash to land a final blow for the catch.
One popular 'Ash Catches Legendary Pokemon' fanfic is 'The Legendary Bond'. In this fanfic, Ash has a series of encounters with different legendary Pokemon that are really exciting. It shows his growth and determination in a new light. Another good one could be 'Ash and the Legendary Quest' which focuses on Ash's journey to find and catch multiple legendaries across different regions. The way the author describes the battles and the relationships Ash forms with the legendaries is really engaging.
The appeal lies in seeing Ash in new and exciting situations. With legendaries involved, his journey becomes more epic. It's like taking the underdog story of Ash in the anime and supercharging it.
In Ash-centered legendary Pokemon fanfiction, often Ash has extraordinary adventures. He might form unique bonds with legendary Pokemon that are not seen in the official storylines. For example, he could befriend a Mewtwo and together they face off against an evil organization trying to clone more powerful Pokemon. These fanfictions allow for a lot of creativity, expanding on Ash's character and his relationships in the Pokemon world.
One implication is that he would be extremely powerful. He could easily dominate Pokémon battles and tournaments.
One of the Legendary Pokemon could be Giratina. Despite its somewhat dark and otherworldly nature, Giratina might be intrigued by Ash's light - heartedness and his ability to make friends with all kinds of Pokemon. Dialga and Palkia could also be part of the harem. Dialga, with its control over time, might see Ash as an important factor in the future of the Pokemon world. Palkia, in charge of space, could be interested in how Ash navigates different regions and spaces in his journey. And don't forget about Ho - Oh. Ho - Oh is a symbol of hope and might see Ash as a bringer of hope in the Pokemon world, thus joining his harem.
Arceus is quite popular. Given that it's considered the creator of the Pokemon universe in the official lore, it often has a significant role in fanfictions. Mewtwo is also very common. Its powerful psychic abilities and complex backstory make it a favorite for fanfic writers to explore. Another popular one is Lugia. With its majestic appearance and its connection to the sea, it's often a central figure in many stories.