I have no clear idea. But perhaps it's a story where Ash teams up with the Teen Titans to catch and train Pokemon, or they face off against common enemies in a Pokemon-themed adventure.
One idea for an Ash fanfiction involving Pokemon and Teen Titans could be that Ash gets transported to the Teen Titans' world. He could team up with them to fight a new kind of villain that is using Pokemon - like abilities. Ash would bring his knowledge of Pokemon training, while the Teen Titans contribute their unique powers and combat skills.
Ash could fit into the Teen Titans' universe as a unique addition. He might initially be a bit of an outcast because of his different methods and his focus on Pokemon. But his determination and kind heart would soon earn him the respect of the Titans. For instance, when facing a threat that requires quick thinking and adaptability, Ash's experience in various Pokemon battles would come in handy.
Maybe there's a device that mixes the powers of Pokemon and the abilities of the Teen Titans. Ash and Raven find this device and have to figure out how to control it before it falls into the wrong hands. Along the way, they learn about each other's worlds and grow as characters. Ash could teach Raven about the bond between a trainer and Pokemon, and Raven could show Ash some new ways to use his strategic thinking with her knowledge of magic and combat.
Ash and Raven could interact in a more friendly way if they meet in a neutral place. Ash could show Raven his Pokeballs and explain how they work, and Raven could share some of her magic knowledge with Ash. They might even start training together, with Ash teaching Raven how to work with Pokemon in combat, and Raven teaching Ash some new combat techniques using her magic.
Yes, there are many. Some might focus on crossovers where Ash, from his own universe, somehow ends up in the world of the Teen Titans. He could bring his unique skills and personality, and have all sorts of adventures with the Titans, like fighting common enemies or learning about each other's powers.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can use the search function to look for stories specifically about Ash and the Teen Titans. There are usually tags and filters that can help you narrow down your search to the type of story you want.
I'm not sure. Maybe there's a crossover or a fan-made creation combining the two, but it's not a common or established connection.
There might not be a direct connection. Pokemon are fictional creatures, while cartoon dogs are a different type of character. But maybe in some crossover or fan-made content, they could be combined.
In Pokemon fanfiction, the love between Ash and Serena is often depicted in a very sweet way. It shows how their adventures together gradually bring them closer. Serena is usually shown as having a deep admiration for Ash's determination and skills.
One common theme is the corruption of power. In many 'dark teen titans fanfiction', the Titans' powers are either misused or turned against them, leading to a lot of internal and external conflict.