Adventure is also a big theme. They often go on pokemon - hunting adventures, explore new regions, and face different kinds of pokemon battles together. For example, in many stories, they might be on a quest to find a rare pokemon. And as they journey, their bond strengthens.
Friendship is a very common theme. The relationship between Ash and the reader usually starts as friends and may grow into something deeper as they share their pokemon - related experiences.
Another common theme is growth. Both Ash and the reader tend to grow as individuals and as a team. The reader may start as a novice trainer and learn a great deal from Ash. Meanwhile, Ash also may learn new things from the reader. Their mutual growth is often a central part of these stories. This can be seen in how they develop new battle strategies or become more empathetic towards pokemon.