Yes, there are quite a few. You can find some on popular fanfiction websites. Some might focus on Ash's epic journey to catch Arceus, with detailed battles and his growth as a trainer along the way.
Well, in many such fanfictions, the story often starts with Ash stumbling upon a very rare or dangerous situation that leads him to encounter Arceus. Maybe he's exploring a mysterious new region and discovers something that Arceus is involved in. Then, through his typical determination and kindness, he manages to form a connection with Arceus. This could involve helping Arceus out of a tough spot, like being trapped by some evil force or being affected by a strange phenomenon. And finally, Arceus, seeing Ash's pure heart, allows Ash to catch it, which then changes the whole dynamic of the Pokemon world in the fanfiction as Ash now has the most powerful Pokemon by his side.
In these fanfictions, a common element is the role of Ash's friends. They might either support him directly or be in some sort of trouble that Ash needs to solve with Arceus's power. Additionally, the power of Arceus is often depicted in a very unique way. It could be used to heal the Pokemon world, or to restore balance in some way. And of course, Ash's own growth as a trainer is always a central part, as catching Arceus is like the ultimate achievement in his Pokemon - catching journey.
One common theme is the power - up of Ash. Once he catches Arceus, he often becomes an even more formidable trainer. Another theme is the exploration of the relationship between Ash and Arceus. It could be a respectful partnership or Arceus could act as a sort of mentor to Ash.
In the fanfic, it could be that Arceus has its own reasons for allowing Ash to catch it. Maybe it sees Ash as the key to restoring balance in a world that is slowly being corrupted by human greed and over - exploitation of Pokemon resources. So, as Ash catches Arceus, he is thrust into a mission to cleanse the world. He might have to travel to different regions and use Arceus's power to heal the damaged environments and reconcile the differences between humans and Pokemon.
Common themes include the relationship between Ash and his Pokémon. When trying to catch Arceus, his Pokémon's trust and support are crucial. Additionally, the idea of a grand adventure is common. It's not just about catching Arceus but also the journey there. There could be new places to discover, new Pokémon to meet, and new challenges to overcome. And of course, the theme of Ash's unique bond with Arceus is often explored, whether it's a spiritual connection or something more tangible.
I'm not sure of a specific 'Ash Catches Arceus' fanfiction off the top of my head. However, you could also check out Wattpad. Sometimes fan-made stories on there are really creative. Maybe there's one where Ash catches Arceus in a really unexpected way, like during a time - travel related event or in a parallel universe where the rules of Pokemon catching are a bit different.
In many Pokemon fanfictions where Ash catches Machop, it often shows Ash's growth as a trainer. Maybe he discovers Machop in a unique situation, like in a hidden valley. Machop is a strong and determined Pokemon, so when Ash catches it, it could potentially become one of his most powerful allies. It might be a story full of adventure and challenges as Ash tries to train Machop and bond with it.
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.
One possible scenario in this fanfiction could be that Ash encounters Mewtwo in a new, uncharted region. Mewtwo, being intrigued by Ash's unwavering spirit, decides to test him. Ash passes the tests with the help of his Pikachu and other Pokemon. This leads to Mewtwo seeing Ash as a worthy trainer and allowing itself to be caught. It would be a great twist on the usual Pokemon-catching storylines.