I recommend " The Post-Elf Era " to you. This is a light novel by the author, Yu Mengjing. The plot of this novel was set in the period of environmental destruction after the nuclear war. Humans and Pokémon fought for a hundred years, and the various forces divided, forming a unique wasteland civilization. A young man from a civilized world appeared on this turbulent wasteland. He wanted to go against the current, clean up the wilderness, rebuild civilization, and bring us step by step into the familiar world of Pokémon. I hope you will like this novel.