In fanfiction, when Ash takes Charizard to Alola, they might have all kinds of adventures. Charizard could help Ash in battles against the unique Alola Pokémon. It could also be a chance for Charizard to interact with new Pokémon species and form new friendships or rivalries. Maybe it would even learn some new moves from the local Pokémon trainers or from the environment of Alola.
One possible fanfiction could be about Ash bringing his Charizard to Alola for a special battle tournament. Ash and Charizard would have to adapt to the new environment and battle styles in Alola. They might face off against some of the unique Alola Pokémon and trainers, with Charizard's powerful fire - type moves being a real asset but also a challenge as they try to avoid causing too much destruction in the beautiful Alola region.
The climate in Alola might affect Charizard. Since it's a tropical region, it could make Charizard a bit more adaptable to warmer and more humid conditions. Maybe its fire - type moves will become even more powerful because of the abundant sunlight in Alola.
It could be that Ash believes Charizard's experience and strength can be useful in Alola. There might be some tough challenges in Alola that only Charizard can help him with. Also, Ash might want Charizard to experience a new environment and different Pokémon species.
They might have all kinds of adventures. For example, they could explore the unique Alola regions, discover new Pokémon species that are native to Alola. Charizard might also have some interesting interactions with the local Pokémon, like friendly battles or just sharing the same space. Ash could use Charizard to traverse difficult terrains in Alola, like the volcanic areas.
Perhaps there could be a plot where Charizard accidentally causes a wildfire in Alola. Ash then has to take responsibility and with the help of the local Pokémon and trainers, they work together to put out the fire and repair the damage. This would show the importance of environmental protection and how Ash and Charizard learn from their mistakes in a new region.
In some 'ash takes charizard to kalos fanfiction', the plot could revolve around Charizard getting sick or injured in Kalos due to the new environment. Ash then has to search for a cure or a way to heal Charizard. This could lead him to meet some kind of Pokemon healer in Kalos who teaches him new techniques to take care of Charizard. And during this time, Ash also has to deal with any threats that come their way while Charizard is recovering.
Ash may become more mature. He starts to think more strategically about his battles and Pokémon training. His understanding of the Alola region's Pokémon and their abilities deepens.
In fanfiction, Ash and Greninja might have all kinds of adventures in Alola. They could encounter new Pokémon species that are unique to Alola. Greninja could show off its skills in the new environment, impressing the local trainers. Maybe they'll participate in the Alola Pokémon League together and face strong opponents.
Greninja might adapt quickly. It could use its natural agility to explore the new terrains of Alola. The warm climate and different types of water sources might be new to it, but it could adjust well. For example, it might find new hiding spots in the Alola forests or enjoy swimming in the crystal - clear Alola waters.