Often, the main protagonist who is on the journey to explore the Z - adventures is quite popular. They are usually the ones driving the story forward with their determination and growth. Another popular character could be the rival, who constantly challenges the main character and adds an element of competition.
One interesting plotline could be the discovery of new and rare Pokemon species in the 'pokemon z adventures fanfiction'. Another might be the character's journey to overcome unique challenges that are specific to the Z version of the Pokemon world. For example, dealing with a powerful new villain who has a special connection to the Z - power crystals.
Well, a cool concept for Pokemon and Dragonball Z fanfiction could be that the energy in the Dragonball Z world affects Pokemon in strange ways. For example, Pikachu could learn to use Ki blasts. Also, a story where the Z - fighters visit the Pokemon regions and have to participate in Pokemon battles to save the day. And a more complex idea would be a fusion of the two worlds' power systems. Say, a Pokemon trainer figures out how to use Ki to enhance their Pokemon's abilities, and in turn, the Pokemon help the trainer in combat against the powerful foes in the Dragonball Z world.
The chemistry between Ash and Serena is really appealing. Ash is always so focused on his Pokemon journey, and Serena brings a different dynamic with her goals related to Pokemon showcases and her feelings for Ash. Fanfiction allows fans to expand on their interactions, like in a story where they might team up against a powerful villain in the Kalos region, which wasn't fully explored in the original series.
One interesting plot could be that the Pokemons are suddenly exposed to the energy of the Dragon Balls. Some Pokemons start to gain Saiyan - like abilities. For example, Pikachu could become Super Saiyan Pikachu, with its electric powers amplified to an extreme level. It could then face off against powerful Pokemon villains in a whole new way, with the fast - paced combat style of Dragonball Z.
In some fanfictions, Goku could team up with Ash. Goku's super strength and ability to fly would be a great asset. He could help Ash in battles against tough opponents like Team Rocket when they use more powerful Pokemon or machinery. Also, Goku might be intrigued by the concept of Pokemon evolution, which is somewhat similar to Saiyan power-ups.
One great fanfiction could be 'A Journey of Hearts'. It beautifully explores the relationship between Ash and Serena as they travel through the Kalos region. The story has some really touching moments where Serena's feelings for Ash are more deeply explored.
Another candidate could be Dialga from Pokemon. Dialga has the power to control time. In a crossover, if it could use its time - control abilities effectively against the Dragonball Z characters, it could be very powerful. For example, it could freeze time and then attack its opponents without them being able to react. But again, Goku has shown the ability to break through all kinds of limitations, so he might still find a way to defeat Dialga in the end.
One idea could be that Goku and his friends are on a quest to find the rarest Pokemon in the Dragon Ball Z world. Maybe the Dragon Balls have the power to summon legendary Pokemon. For example, the Saiyans could use their fighting skills to train Pokemon for battle. Another idea is that the villains from Dragon Ball Z, like Frieza, try to capture powerful Pokemon to use in their evil plans.
It's hard to say, but Goku would be a top contender. His ability to constantly increase his power level and learn new techniques would make him a force to be reckoned with, even in a world with Pokemon. He could potentially use his Ki to enhance the abilities of any Pokemon he teams up with.