Well, in this fanfic, Ash catching Latias could be a really unique story. Since Latias is a very special and somewhat elusive Pokémon. Ash could have to go through a series of adventures in a new region. He might need to learn about Latias's habits and favorite places. And perhaps, he has to team up with some new friends or even old rivals who have also heard about Latias. In the end, his kindness and love for Pokémon would be the key factors in catching Latias.
In such a fanfic, Ash might catch Latias using his usual determination and battle skills. Maybe he first encounters Latias when it's in trouble, like being chased by some bad guys or trapped in a dangerous situation. He would then use his Pokémon team to protect it and gain its trust over time. Eventually, with a well - executed Pokéball throw, he catches Latias.
One possible plot is that Latias is injured and Ash finds it. He nurses it back to health, and during this process, they form a bond. Latias then decides to join Ash's team. Another plot could be that there is a tournament where the prize is a special item that can attract Latias. Ash enters the tournament, wins, and uses the item to catch Latias.
Ash could catch Latias in a place full of ancient ruins. Latias might be guarding some sort of Pokemon relic there. Ash shows respect for the place and Latias' role. This makes Latias interested in him. Eventually, Ash catches Latias and they go on to discover more about the relic's power together.
Imagine a scenario where Ash is in a different dimension or a special realm where the rules of Pokémon catching are a bit different. He meets Ho - Oh there, and instead of using a traditional Poké Ball, he has to use a special item or perform a unique ritual. This would make for a very interesting and unique fanfic as it deviates from the normal Pokémon - catching methods we are used to.
In the fanfic, Absol might be in some kind of trouble that Ash has to rescue it from. After that, Absol decides to join Ash's team. Ash would then have to train Absol and figure out how to best utilize its skills. They could go on adventures together, facing various challenges and meeting new Pokémon along the way. Absol could also introduce Ash to new areas or Pokémon that are related to its own origin or habitat.
One possibility is that Ash catches Machop during a special event. For example, there could be a local Pokemon tournament where Machop is a prize for the winner. Ash participates and wins, thus getting Machop. Machop then quickly becomes part of Ash's team and starts training with the other Pokemon.
Another possibility is that Ash wins the battle. Even though Misty has a new Pokemon, Ash's experience and the strong bond he has with his Pokemon could give him the edge. He might be able to quickly analyze the new Pokemon's weaknesses during the battle and use his Pokemon's attacks effectively to secure the victory.
In the fanfiction, Ash could be on a special quest to catch Tapu Koko. It could be related to saving the Alola region from some kind of threat. So, catching Tapu Koko becomes not just a personal achievement but also a way to protect the land and its people. He might need to prove himself worthy to Tapu Koko before it allows itself to be caught.
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.
One possible plot twist could be that Latios and Latias are actually under the control of a more powerful and evil Pokémon. Ash initially thinks he's caught them to protect them, but then discovers he has to fight against the real threat that has been manipulating them all along.
Well, it could be about Ash traveling to a remote area, like a hidden forest or a mysterious island where the rare pokemon is rumored to live. He might face many challenges on his way there, like tough terrains or other aggressive pokemon. Then, when he finally encounters the rare pokemon, it could be a really intense battle where he has to use all his skills and knowledge of pokemon to catch it.