Summoned from his unjust suffering in the mundane world, Spike finds himself before Arceus, who opts to send him to the world of Pokemon with the request to assist in maintaining the world's harmony. Afterwards, Arceus sends him off with the egg of a Riolu who will be his partner along the journey. Next thing he knows, he wakes up with a headache in the body of a five-year-old boy in the middle of a forest in Hoenn. Thus begins the journey of a Pokemon Ranger who will come to be feared by those hiding in the dark of the Pokemon world.
____________________________________________________________
Author Note:
Please keep in mind that this is an AU (Alternate Universe). I will be taking aspects of the Pokemon world that I find to be the most fun and enjoyable and editing some things as I see fit. The world will contain some elements and characters from the anime, manga, and games, but it will also have some original characters and a mostly original storyline. It will not go fully grimdark like some gritty parts of the manga or some more realistic fanfictions, but also won’t be all sunshine and roses like the games. 
Overall, I do want to keep the story on the lighthearted side, but there will be some more serious plots as well. About 90% taking the story seriously and 10% wish fulfillment, I suppose.

Note: I am also posting this fanfiction on Webnovel. No difference on release times for chapters.
Also, as an update because of the people who messaged me about the multiple transmigrators, the existence of other transmigrators won't have much, if any, affect on the main plotline (or the harem if that's what those people are worried about). There will only be a handful of interactions with a few of the transmigrators during some of the more dangerous scenarios I have planned. I don't expect this to change anybody's mind, but thought it was worth mentioning. Also, I edited the first chapter to make this more obvious.
Disclaimer: I do not own Pokemon or speak for GameFreak, Nintendo, or Pokemon. I'm just a fan having some fun in his free time.