Well, for one thing, Milotic is not your typical starter Pokemon in the official games. So, a fanfic that starts with it already has an element of novelty. It can explore the trainer's journey in a different way compared to if they had started with a more common starter. The fanfic could also delve into the lore behind Milotic, like its evolution from Feebas, and how that backstory affects the trainer - Milotic relationship and the overall plot of the story.
Well, one possible plot could be that the protagonist starts their Pokemon journey with a Milotic. They might face challenges in training it as Milotic is a rather elegant and somewhat difficult to train Pokemon. Maybe they enter a Pokemon beauty contest where Milotic's natural grace gives them an edge, but they also have to deal with jealous opponents who try to sabotage them.
A great Pokemon Turtwig starter fanfic often has a well - developed plot. It should have an interesting story arc that involves Turtwig's growth and development, not just as a Pokemon but also in its relationship with the trainer.
One interesting plot could be a young trainer who gets a starter that is considered weak, like a Caterpie, but through hard work and unique training methods, it evolves into a powerful Butterfree that surprises everyone. Another could be a trainer who has an unexpected bond with their starter right from the start, for example, a Pikachu that refuses to go into a Pokeball and they form a really close relationship like Ash and his Pikachu in the anime.
The different evolution paths of Eevee can be a really interesting element. For example, the trainer might be conflicted about which evolution to aim for, whether it's the speedy Jolteon, the tough Flareon, or the elegant Espeon. Each evolution could represent a different path for the trainer and Eevee's relationship and their future in battles and adventures.
The clash of two different universes makes it interesting. Naruto has its ninja world full of jutsus and complex characters, while Darkrai is a mysterious Pokémon. Combining them can lead to unique storylines, like Naruto having to deal with Darkrai's nightmares or using his ninja skills to catch it.
One idea could be that a trainer starts with a Rotom as a starter in a region where it's not common. The Rotom could have unique abilities that help the trainer overcome challenges in the early gym battles. For example, its electric - type moves combined with its ability to possess different appliances could give it an edge in battle.
A really interesting plot might be that the Eevee is actually a reincarnation of a great Pokemon hero from the past. The trainer discovers this as they journey together and face various challenges. This knowledge makes them a target for an evil organization that wants to use the Eevee's power for their own malicious purposes. Along the way, the Eevee and the trainer meet other Pokemon and trainers who either help or hinder them in their quest to protect the Eevee's secret and fulfill its destiny.
The plot could involve a young trainer starting their journey with Charizard. They might face challenges like battling against powerful gym leaders. Charizard could have unique abilities that help the trainer progress, like a special fire - based move that overcomes water - type opponents easily.
One common theme is friendship. Since Ditto can transform into the starters, it often forms unique bonds with them. Another theme is identity. Ditto has to figure out who it is in relation to the starters. For example, in some fanfics, Ditto struggles with whether it should always be like the starters or be its own unique self.
One possible plot is that Treecko gets separated from its trainer early on. It then has to find its way back, facing many dangerous Pokemon on the way. During this journey, it learns new skills and becomes more independent.