Idea #13 (Pokemon & Time Loop)

This is a Pokemon and Time Loop story.

The story starts with Ash, but he dies to the first Legendary he sees. After that he wakes up in his bed on the start of his journey. He keeps redoing it until he can stop the legendary (in order of appearance in Anime and movies, except for Ho-oh at the beginning of his journey and certain non-threatening encounters) Each time he may get different Pokemon to help with the final result, but that final result only extends to the next legendary encounter on his journey where he might die and have to restart all of his journeys from the beginning.

You can also go the route where Ash never existed in this world and because they don't have the buffer of the chosen one, every time a legendary would get out of hand someone would have to step up. That person would be the main character and they would go a similar route to Ash in the anime, but they could be an OC or whatever you want really.

These both can lead to some really unique teams, and the author can explore writing different Pokemon and their personalities, their forms, etc.