Maybe a veteran trainer who has made some mistakes in the past. He or she decides to give a second chance to a Pokemon that others have given up on. This trainer uses their experience and new - found determination to help the Pokemon reach its full potential and in the process, the trainer also gets a new lease on their own life in the Pokemon world.
It could be a Pokemon itself. For example, a Pikachu that has been separated from its original trainer and has to fend for itself in the wild. But then it meets a new friend, either a human or another Pokemon, who helps it start over. This Pikachu could be the focus of the story as it overcomes its past traumas and looks forward to a new life.
It could be an older trainer who has been through a lot in the Pokemon world and is now getting a second chance. Maybe someone who was once a gym leader but lost their position due to some scandal and now wants to prove themselves again.
The plot could involve a Pokemon that was once weak or injured getting a new chance at life. Maybe it was abandoned by its trainer and then found by a kind-hearted person who nurses it back to health and trains it to become strong. This new bond could be the central theme, showing how love and care can transform a Pokemon's life.
It could be a scientist who is involved in the study of Pokemon genetics. While trying to understand the mechanics of evolution better, they accidentally stumble upon the new evolution and then become involved in the events that unfold as a result, both in the scientific and the trainer communities.
It could be a young and inexperienced trainer who is just starting their journey in this new world. They have big dreams but a lot to learn.
It could be a side character from the original work who didn't get much spotlight. Giving them a chance to live could provide an opportunity to explore their backstory and develop their character further. For instance, a minor character who was killed off early in the story could now become the hero.
It could be an ordinary person from our world, like a high school student. They're suddenly thrust into this new world and have to adapt. Their inexperience in this new environment can lead to many humorous and exciting situations.
Obviously, the main character could be the new Magma Grunt. He could be a fresh recruit with a different perspective compared to the more experienced members of the team.
Well, it could be about a trainer who has failed in their previous Pokemon journey, maybe they lost a big tournament or had their Pokemon severely injured. But then they get a second chance. They might discover a new region with rare Pokemon species and use this opportunity to train differently, focusing more on the bond with their Pokemon rather than just winning.
A Ditto could be the main character. Since it can transform into other Pokemon, it could have a unique perspective on different Pokemon species and their lives.
A Charizard might be the main character. Imagine a Charizard that was always too proud and aggressive. Then it turns over a new leaf and becomes more gentle and uses its fire - breathing ability to help others, like warming up cold areas or helping with cooking in a village.