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.
The change in its appearance can make it scary. For example, if its usually cute yellow fur turns dark or if its bright red cheeks become a sinister red glow. Also, if it starts to behave in an uncharacteristic way, like making menacing noises instead of its usual cute sounds.
A Litten might be a good choice for Serena. It has a fiery personality and could bring a new dynamic to her team. With proper training, it could become a powerful Fire - type Pokemon in battles against water - type opponents in Alola.
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.
Obviously, the main characters are usually Pikachu. But sometimes, there could be other Pokémon that play important supporting roles. For instance, a Pichu could be a sidekick or a younger Pokémon that the Pikachus are protecting.
One interesting plot could be two Pikachus from different regions meeting and learning about each other's unique electric attacks. For example, one Pikachu might know a special move that the other has never seen before. They could then teach each other and become stronger together.
Sure. 'Ash's Alola Pokemon Team' is a fanfic that centers around exactly that. It shows how Ash assembled his team in Alola, the training they went through together, and their unique bonds. Another one is 'The Alola - bound Pokemon of Ash' which gives insights into the individual personalities of his Alola Pokemon and how they work together as a team.
Naruto would probably be really excited. He'd treat Pikachu like a new friend and teammate. He might try to learn all about Pikachu's powers and how it can help in battles. For example, he'd be eager to see Pikachu use Thunderbolt in a fight against an enemy ninja.
Lucario is also a popular choice to be paired with Pikachu in crossovers. Lucario has its own unique abilities related to sensing and combat. When combined with Pikachu's electric attacks, they can form a formidable team. The contrast between Lucario's more serious and stoic nature and Pikachu's cute and energetic personality also adds depth to the story.