Well, it could be about a group of Pokemon being forced to work in a farm against their will in the Mystery Dungeon world. Maybe they have to grow special berries or take care of rare plants for an evil force. They might plan an escape together while facing various challenges in the farm.
A Pikachu could be a main character. Pikachu is a very popular Pokemon and it would be interesting to see it in such a tough situation. Maybe it uses its electric powers in clever ways to resist the slave work or to communicate with other Pokemon secretly.
Well, it could be about a group of Pokemon who are wrongly imprisoned in the Pokemon Mystery Dungeon world. They then have to find a way to prove their innocence and escape the prison. Maybe they form alliances with other inmates and discover secrets about the prison along the way.
One interesting storyline could be about a Pokémon slave who discovers a hidden power within itself and uses it to break free from its captors. It might then go on a journey to free other enslaved Pokémon.
The plot could involve Treecko being chosen for a special mission in the mystery dungeon. Maybe there is a powerful and ancient artifact hidden deep within the dungeon that has the power to change the balance of the Pokemon world. Treecko, despite being small and not as powerful as some other Pokemon, is selected because of its determination and pure heart. Throughout the story, Treecko has to overcome many obstacles, both physical and mental, to reach the artifact and decide what to do with it.
The original Pokémon Mystery Dungeon concept focuses on adventure, exploration, and friendship among Pokémon. In contrast, the slave fanfiction delves into darker themes like slavery and oppression. It's a much more somber take on the Pokémon world.
Riolu could find a rare treasure in the mystery dungeons.
One idea could be a story where the main character, a Pokémon in the mystery dungeon world, discovers a hidden power within themselves that no one else has. This power could be the key to saving the Pokémon world from an impending doom, like a strange and powerful dark force that is corrupting the dungeons. Another plot could revolve around a Pokémon who wakes up in the mystery dungeon world with no memories at all, and has to go on a journey to find out who they really are and where they came from. They might encounter various Pokémon along the way that seem familiar but can't quite place them.
Well, if we were to consider this, perhaps in a very dark and alternate universe, Ash could be captured by Jessie's team and made into a slave to do their bidding. Maybe he has to perform tasks like finding rare Pokemon for them or doing all the grunt work at their base. But again, this is a very far - fetched and not very in - line - with - the - spirit - of - Pokemon idea.
Well, a plot idea could be that Charmander is wrongly accused of causing chaos in the Pokemon Mystery Dungeon. It has to prove its innocence while also dealing with other Pokemon who are now afraid of it. It could go on a journey within the dungeon to find the real culprit. Another interesting plot is that Charmander finds a magical item that gives it the ability to talk to other Pokemon species in their own languages. This new power helps it form alliances and solve mysteries in the dungeon that were previously unsolvable. And also, a story where Charmander has a prophetic dream about a great disaster in the dungeon and has to convince other Pokemon to take action before it's too late.
Another plot could involve Naruto being turned into a Pokemon. He has to adjust to his new form and learn how to use Pokemon - like abilities. He might struggle at first, but with the help of his new Pokemon friends, he gradually masters his new powers and uses them to save the Pokemon world from a great threat.