It could be a group of Team Rocket - like villains. They are after the unique powers that the reborn pokemon might possess. Since the reborn pokemon has a human - like intelligence, they see it as a valuable asset to use for their evil plans, like stealing all the precious pokemon resources or taking over a certain region.
The story of Pokemon Reborn can be lengthy. If you're thorough and take your time to enjoy all aspects of the game, it could take you more than 30 hours. But if you just focus on the main quests, it could be shorter, maybe 15-20 hours.
One idea could be the main character being reborn as a Pikachu and having to navigate the world with its electric powers while making friends with other pokemon. Another could be being reborn as a Eevee and having the unique ability to evolve into any form at will, which causes both envy and admiration among other pokemon. Maybe the reborn pokemon has memories of being a human and uses that knowledge to outwit trainers and other threats.
In the world of Pokemon Reborn fanfictions about Ratta, there are some that delve deep into the lore of the Reborn region. For example, one fanfiction I read had Ratta being involved in an ancient prophecy of the Reborn region. The story was filled with mystery and adventure. There are also fanfictions that focus on Ratta's battles in the Reborn gyms, showing its strategic thinking and growth as a Pokemon.
One great Pokemon Reborn Harem Fanfiction is 'A New Journey in Reborn'. It has an interesting plot where the main character gradually builds a harem of different Pokemon trainers. The character development is well - done, and it shows how they all interact and grow together.
One great Amaria fanfiction in Pokemon Reborn is 'Amaria's Adventure'. It delves into her backstory more deeply, showing her journey before she was known in the game. It has some really interesting character development for her.
A possible fanfiction could involve Tyranitar being a powerful protector in the Pokemon Reborn world and Rattata being an unexpected ally. Maybe Rattata has some unique ability that Tyranitar discovers during a battle against a common enemy, and they form an unbreakable bond as a result.
Proper pacing. It shouldn't rush into forming the harem. There should be a natural progression. Maybe start with the main character meeting one potential harem member, having some adventures together, and then gradually adding more members over time. This gives the reader time to get to know each character and their relationship with the main character.
Often, in reborn as a Pokemon fanfiction, the protagonist might have some special ability. This could be the ability to understand Pokemon language perfectly. They then use this to their advantage, making strong bonds with their Pokemon team. Also, there are plotlines where the character has to save the Pokemon world from an evil organization that wants to use Pokemon for bad purposes.