When Ash catches a Jirachi. The fanfic usually shows how Jirachi's wishes can change the course of Ash's journey. The moment when Ash figures out how to make Jirachi trust him enough to be caught is full of emotion and excitement. It's a moment that really showcases Ash's growth as a Pokemon trainer.
One of the best moments is when Ash finally manages to catch a Celebi in some fanfics. The build - up to that moment, with all the time - traveling adventures and the connection he forms with Celebi, is really thrilling.
One popular 'Ash Catches Mythical Pokemon' fanfiction is 'The Legendary Encounter'. In this story, Ash stumbles upon a hidden grove where he meets Mew. It's a really exciting read as it shows Ash's determination and the unique bond he forms with Mew.
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.
In many fanfictions where Ash catches Lugia, it often involves a great adventure. Maybe Ash stumbles upon Lugia in a hidden cove. Lugia, being a powerful and majestic Pokémon, would be a huge addition to Ash's team. It could change the dynamic of his battles completely. He might have to prove himself worthy to Lugia first, perhaps by showing his kindness and determination in protecting other Pokémon in the area.
In some fanfictions, Ash Greninja's moment of saving Ash from a dangerous fall during a battle in the Alola region is really cool. It shows their loyalty and quick reflexes.
The plot could involve Ash hearing rumors about Mewtwo's location. He sets out on a journey to find it. Once he does, he tries to communicate with Mewtwo. Mewtwo initially resists but Ash's pure intentions start to sway it.
A plot might be that Lugia is being hunted by an evil organization. Ash discovers this and decides to protect Lugia. He uses his Pokémon to fight off the bad guys. In the process, he forms a bond with Lugia. Eventually, Lugia realizes that it's safe with Ash and allows itself to be caught. This would show Ash's heroism and his love for Pokémon.
Another possibility is a Celebi. Celebi is a time - traveling pokemon. Ash could be led to Celebi by some strange time - related events. It would be a challenging catch as Celebi can manipulate time to avoid capture. But with Ash's experience and the unique skills of his pokemon, he might be able to succeed.
A fanfic could be centered around Ash exploring a new region where Mimikyu is said to be very common. Ash is eager to add a new and different Pokemon to his team. He meets a local trainer who tells him all about Mimikyu's habits. Ash follows the trainer's advice and goes to a particular meadow where Mimikyu likes to play. He waits patiently until he sees a Mimikyu. Ash then uses his best Pokeball and with a little bit of luck, catches Mimikyu. Once caught, he discovers that Mimikyu has some hidden powers that he's excited to explore and train with.
There's a fanfic called 'Ash's Mastery of Pokemon Catching'. It shows Ash using unique strategies to catch different types of Pokemon. For example, he uses his knowledge of Pokemon behavior to outwit them. Also, 'The Golden Pokeball Adventure of Ash' is an interesting one. Ash finds a special Pokeball that has unique powers for catching Pokemon, which leads to a series of thrilling events.