You could write a fanfic about a time - travel plot. A trainer from the present day in the Pokemon world somehow gets sent back to the time period of Pokemon Gold and Crystal. They have to use their knowledge of modern Pokemon training and battling to survive in this older era. They could also meet the original protagonists from those games and help them with challenges they faced, or even change the course of history in the Pokemon world in small but significant ways.
A plot idea could be to set the fanfic in an alternate Johto region where the roles of Pokemon types are reversed. Electric - type Pokemon are weak to Ground - type, but in this fanfic, it could be the other way around. The story could follow a trainer trying to adapt to these new rules while also uncovering a conspiracy behind this strange change. Also, you could explore the backstories of the Gym Leaders in a more detailed manner, like their childhoods and what led them to become Gym Leaders.
One idea could be exploring an alternate timeline where the main character makes different choices in the game. For example, choosing a different starter Pokemon and how that changes their entire journey through the Johto region.
One idea could be a story about a trainer who discovers a rare and powerful Pokemon in the Johto region that is not typically found in the games. For example, a shiny, alpha form of a Pokemon like Totodile. The trainer then has to protect this Pokemon from a mysterious organization that wants to use it for evil purposes.
One idea could be a story where the protagonist's Pokemon from Pokemon Gold teams up with a Pokemon from Pokemon Crystal to face a new, powerful and mysterious threat that neither region has seen before. For example, a dark force that is causing natural disasters in both Johto and the Crystal region.
Well, a cool plot for 'pokemon adventures gold and crystal fanfiction' could be centered around a time - traveling pokemon. This pokemon accidentally sends the main character back in time to when the Johto region was first being settled. The character then has to figure out how to get back while also dealing with the primitive pokemon training methods and different cultural views of pokemon. Or perhaps a plot where a powerful but cursed pokemon is found in the Crystal Cave. It curses those who try to catch it with bad luck, and the main character has to find a way to break the curse and catch the pokemon without getting too much bad luck himself. Also, a plot about a secret pokemon league tournament that only the best trainers in Johto are secretly invited to could be really exciting.
One interesting storyline could be about the unique bond between a trainer and their Pikachu in the 'pokemon gold x crystal' universe. Maybe the Pikachu has some special abilities that are explored in the fanfic.
One idea could be exploring an alternate timeline where the main character makes different choices. For example, choosing a different starter Pokemon and how that changes their entire journey. Another could be focusing on the backstories of the Gym Leaders in the Pokemon Gold game, like what led them to become Gym Leaders.
One idea could be Ash and Crystal teaming up to explore a new, mysterious region filled with rare Pokemon. They could encounter a powerful and previously unknown Legendary Pokemon that they have to work together to understand and protect.
One interesting story could be about a trainer in Pokemon Gold who discovers a rare, never - before - seen Pokemon variant. In fanfiction, authors often take creative liberties to introduce new elements like this. Another could be a story that focuses on the relationship between the characters in Crystal, such as the bond between a trainer and their starter Pokemon evolving in an unexpected way.
A cool plot for a Crystal Story 2 fanfic could be a story centered around a magical item that has been lost in the game world. The main character hears rumors about it and sets out on a quest to find it. Along the way, they face challenges from other characters who also want the item for their own reasons. It could also be interesting to write a fanfic about a character who gets cursed and has to find a way to break the curse while still dealing with the normal threats in the game world. Or perhaps a fanfic where two characters from different factions fall in love and have to overcome the differences between their groups.
One idea could be exploring an alternate version of the Gold story where the protagonist teams up with a rare and powerful Pokemon from the start. This would change the power dynamics and how he faces challenges.