One idea could be that Pikachu and Glaceon go on an adventure in a magical forest. They encounter strange creatures and have to work together to overcome obstacles. For example, they might find a lost baby Pokémon and need to reunite it with its family. Another plot could be centered around a competition where they both participate and learn about each other's strengths and weaknesses during the process.
One idea could be that Flareon and Glaceon are on an adventure in a frozen land. Flareon, being a Fire - type, has to constantly keep warm while Glaceon, being an Ice - type, is in her element. They could face a common enemy that threatens the balance of their environment, and through their journey, they learn to appreciate each other's differences. For example, Flareon could use its fire to melt ice that is blocking their path, and Glaceon could use its ice powers to create shelters. This would create a story full of cooperation and friendship development.
Perhaps there could be a plot where Pikachu and Emolga enter a Pokémon - only talent show. Emolga wants to show off its flying skills, while Pikachu plans to use its electric attacks in a creative way. They have to practice hard and deal with some jealous Pokémon who try to sabotage them.
One idea could be that Sylveon and Pikachu go on an adventure in a magical forest together. Along the way, they discover a hidden glade filled with rare berries. As they share the berries, their friendship deepens in a really cute way.
A possible plot for this fanfiction could be that there is a lemon festival in the Pokémon world. Pikachu is excited to go but is a bit scared of the big Raichu that are usually at these events. However, a friendly Raichu takes Pikachu under its wing and shows it all the amazing lemon - related things at the festival, like lemon - flavoured Pokéballs and lemon - patterned scarves. As they explore together, they become the best of friends and have many adventures during the festival.
One idea could be a story where the human Pikachu and the reader are on a journey to discover a new type of Pokémon. Along the way, they face various challenges like difficult terrains and other Pokémon battles. Their relationship grows as they rely on each other for support and survival.
One idea could be a story where Ash and Pikachu discover a magical lemon grove in a hidden part of the Pokémon world. The lemons there have special powers that can heal Pokémon. Another could be that a lemon - scented Pokémon appears and Pikachu is both curious and a bit scared, while Ash tries to figure out what this new Pokémon is all about.
Some popular themes are rescue missions. Maybe Glaceon gets trapped somewhere and Pikachu has to save it. Or vice versa. Another theme is competition. They could enter a Pokemon contest where they compete against each other in different categories like speed or agility. And there's the theme of discovery. They might discover a new type of Pokemon or a hidden place in the Pokemon world that no one has known before.
One idea could be that Glaceon and Jolteon are from different clans in the Pokemon world. Their clans are at odds, but they discover a common threat that forces them to work together. As they spend time together, they start to understand each other's powers and personalities better, and a deep friendship, or perhaps something more, begins to form.
One idea could be an OC who is a detective trainee and teams up with Detective Pikachu to solve a mystery in a new part of the Pokemon world. Maybe they are investigating a series of disappearances of rare Pokemon. Another plot could involve an OC with a special ability to communicate with certain types of Pokemon that Pikachu can't, and together they use their combined skills to stop a villain who wants to use these Pokemon for evil.
One idea could be that Pikachu suddenly loses its electric powers and Ash has to find a way to help it regain them. This could involve a journey to a mysterious place that is said to have the power to restore Pokemon abilities.