Well, in many Ash and the Legendary Pokemon fanfictions, the theme of destiny often plays a big part. Ash is seen as having a pre - ordained connection with these powerful creatures. It's like he was meant to meet and interact with them. And there's also the theme of the balance of the pokemon world. The presence of legendary pokemon is crucial for this balance, and Ash is sometimes in the middle of maintaining or restoring that balance.
One common theme is the friendship between Ash and the legendary pokemon. Often, they form a special bond that helps Ash in his adventures. Another theme could be the power of the legendary pokemon and how Ash has to learn to handle it. For example, in some fanfictions, Ash might have to control the immense power of a legendary like Mewtwo without getting overwhelmed.
A frequent theme is Ash's role as a savior or protector in relation to the legendary pokemon. He may be the one to rescue a legendary from a dangerous situation or protect it from those who want to misuse its power. Also, the exploration of the unique abilities and characteristics of the legendary pokemon is common. This can include things like the time - traveling abilities of Celebi or the space - warping powers of Dialga.
Often, a theme is adventure. The presence of Legendary Pokemon in Ash's world in these fanfictions usually leads to grand adventures. They might journey to hidden places or face off against powerful foes together. Also, there can be a theme of self - discovery for Ash. Interacting with Legendary Pokemon can make Ash realize new aspects of his own capabilities and his role in the Pokemon world. For instance, if he teams up with Lugia, he might learn more about his ability to communicate with and understand Pokemon on a deeper level.
Protection is also a big theme. Often, Ash has to protect the female legendary Pokemon from villains who want to capture or harm it. This shows Ash's heroic side and also the vulnerability of the legendary Pokemon. In some stories, the female legendary Pokemon also protects Ash in return, highlighting the mutual care between them.
One common theme is Ash forming a special bond with a Legendary Pokemon. Maybe he helps the Legendary in a time of need and they become friends. For example, he could save a Mewtwo from some evil organization and then they team up.
I'm not sure as I don't typically read such fanfictions. But I would assume some common themes could be the exploration of a unique relationship between Ash and the legendary pokemon, perhaps some kind of power dynamic due to the legendary pokemon's abilities.
One common theme is the growth of Ash's character. Catching a Legendary Pokemon is no easy feat, and it often forces Ash to step out of his comfort zone, face his fears, and become a more mature trainer. For example, in many fanfics, he has to learn new battle strategies and ways to communicate with a Pokemon that is far more powerful and mysterious than his usual team.
Articuno, Zapdos, and Moltres are quite common. Their elemental powers and the mystery surrounding them make for great fanfiction material. Ash might encounter them during his travels and have to either help them or face off against them in some way.
One common theme is the power of the bond between the trainer and the legendary pokemon. It's often shown as a key factor in achieving great things. Another theme is the mystery surrounding the legendaries, like their origin and purpose.
One common theme is Ash's self - less heroism. He often puts himself at risk to help the legendary pokemon in trouble. For example, when it comes to rescuing a legendary from a natural disaster or from villains.
The discovery of new Pokemon species is also a common theme. Writers like to create new and unique Pokemon for Ash to encounter. This adds an element of surprise and adventure to the fanfiction, as Ash has to figure out how to interact with and potentially catch these new Pokemon.
One common theme is Ash's growth. Writers like to show how he matures from a novice trainer to a more experienced and wiser one. Another theme is friendship. His relationships with his Pokemon and human friends are often explored, like how they support each other in tough times.