Well, in a Pokemon Latios x Latias fanfic, you can expect a story full of adventure. It might focus on their unique bond as siblings or their powers. Maybe it'll have them teaming up against a common enemy in the Pokemon world, like a powerful villainous team. It could also explore their relationship with trainers or other Pokemon in their environment.
First, do your research on Latios. Know its abilities, personality traits from the Pokemon universe. Then, think about how it would fit into the real world. For example, how would people react to seeing it? Next, create a strong plot. It could be a quest that Latios and the main character go on. Also, develop interesting characters. They should have their own goals and personalities that interact well with Latios.
One of the most popular themes is adventure. Imagine Latios flying over real - world landscapes, taking the protagonist on an exciting journey. Another common theme is friendship. Latios could form a deep bond with a human character, just like in the Pokemon games. And then there's the theme of discovery. Since it's 'IRL' (in real life), the fanfic might explore how humans discover the existence of Latios and deal with this magical creature in our normal world.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. They have a large collection of Pokemon fanfics, and you can specifically search for Latios - related ones.
Common themes in a Pokemon Latios x Latias fanfic include adventure, of course. They are powerful and fast Pokemon, so they can go on all sorts of exciting adventures. Another theme is mystery. Their psychic abilities and their somewhat elusive nature can be used to create a sense of mystery in the story. Also, the theme of friendship might be present, not just between them but also with other Pokemon they meet during their travels. For example, they might befriend a small group of Pokemon that are in trouble and help them out.
In a fanfiction, Ash might have a special bond with Latios. Maybe Latios senses Ash's pure love for Pokemon and decides to team up with him. They could go on adventures, facing powerful foes together. Ash could learn new techniques from observing Latios in battles.
Ash is a great choice. He has a lot of experience with Pokemon and his kind heart could make for an interesting dynamic with Latios. He might be able to understand Latios' needs and help it in its journey. Another good one is Misty. Her strong - willed nature could contrast with Latios' more mysterious side, and they could learn from each other.
Latios might interact with humans in a curious way. Since it's a psychic - type Pokemon, it could sense human emotions and intentions. It might approach friendly and kind - hearted people first. For example, it could be drawn to a child who is always helping others in the neighborhood. It would then use its psychic powers to communicate, like projecting images into the human's mind to show what it wants or needs.
Latios might start by using a protective psychic shield. This would prevent Metagross's initial attacks from doing damage. Then, it could use its flight to gain altitude and survey the battlefield. When it spots an opening, it can dive down and launch a combination of Dragon - type and Psychic - type moves. For example, it could first use a weak Psychic blast to stun Metagross slightly and then follow up with a full - force Dragon Pulse. Since Metagross is a Steel/Psychic type, the Dragon - type move would be super - effective against it, especially if Latios can land a direct hit.
In a fanfic, Latios could potentially win. Latios is a Psychic and Dragon - type Pokemon. It has high speed and special attack stats. It could use its psychic powers to outmaneuver Metagross. For example, it could use Psychic to immobilize Metagross and then follow up with a powerful Dragon Pulse.