In some fanfictions, there could be a backstory where Amber was involved in the creation or discovery of Mewtwo in some way. This could lead to a complex relationship where Mewtwo has mixed feelings towards Amber. On one hand, he might feel a sense of loyalty or connection because of their past, but on the other hand, he could also be wary due to the circumstances of his creation. They then have to navigate these feelings while also dealing with external challenges in the Pokémon world.
One interesting storyline could be Ash befriending Mewtwo in a more in - depth way. Maybe Mewtwo decides to travel with Ash and his team, and they face challenges together. Ash could help Mewtwo understand the true meaning of friendship and trust, which Mewtwo has always struggled with due to its creation and past experiences.
In some fanfictions, the OC might be a Pokemon with a special power that Mewtwo is interested in. For example, the OC could be a shiny Pokemon with the power to heal other Pokemon instantly. Mewtwo wants to study this power and in the process, they become friends. They then team up to help other Pokemon in need, like those that have been affected by pollution or are being hunted by poachers.
One interesting storyline could be Ash befriending Mewtwo in a more in - depth way. Maybe Ash helps Mewtwo understand the true meaning of friendship among humans and Pokemon. He could show Mewtwo that not all humans are bad by introducing him to his friends like Brock and Misty, and how they all care for their Pokemon.
The main characters are obviously Mewtwo, a powerful and genetically - engineered Pokémon, and Amber. However, there might also be other Pokémon characters that play important supporting roles, like Pikachu or Charizard, who could be friends or foes depending on the plot of the fanfiction.
One popular storyline could be Ash and Female Mewtwo teaming up to save the Pokemon world from a new, powerful threat. They might have to overcome their differences at first, with Mewtwo being initially distrustful of humans due to past experiences. Another could be a more emotional story where Female Mewtwo gets injured and Ash takes care of her, leading to a deep bond forming between them. And sometimes, fanfictions explore the idea of them going on a journey together to discover more about Mewtwo's origins.
One interesting storyline could be Ash and the female Mewtwo forming an unlikely friendship. They could start off as strangers, with Mewtwo being cautious of Ash due to her past experiences with humans. But as Ash shows kindness and understanding, they gradually grow closer. For example, Ash could help Mewtwo when she is injured in a battle against a powerful enemy. Another could be a story where they team up to save the Pokémon world from a new, mysterious threat that neither of them could face alone.
A possible plot could be that an evil organization creates a special diaper for Mewtwo which is actually a mind - control device. Mewtwo has to struggle against the control while trying to figure out how to remove the diaper. Or perhaps Mewtwo discovers a group of baby Pokemon who are being mistreated because they are always in dirty diapers. Mewtwo uses its powers to clean and care for them, and in the process, learns about the value of kindness and nurturing.
One idea could be a story where Mew and Mewtwo team up to save the Pokemon world from a new, powerful and evil artificial Pokemon created by humans. They have to overcome their differences first, as Mewtwo still has some resentment towards humans and Mew is more open - minded.
A possible plot is that Ash, while in Mewtwo's form, is hunted by those who fear Mewtwo's power. He has to use his own knowledge of friendship and teamwork, which is so characteristic of Ash, to convince the people and Pokemon around him that he's not a threat. This could lead to some really cool battles where Ash, in Mewtwo's body, shows his unique fighting style combined with Mewtwo's strength.
One interesting storyline could be a human with psychic abilities befriending Mewtwo. They might team up to protect other Pokémon from an evil organization. The human could help Mewtwo understand human emotions better, and in turn, Mewtwo could teach the human how to control and enhance their psychic powers.