Please note that this story will contain several darker subjects, as evident of this prologue. If dark subjects do not set well with you, turn away now while you still can. While the story itself won't contain anything quite as serious, some of it may unsettle you. I don't want to hear complaints if you read this and don't like it, because I have warned you.
It was exceedingly rare for someone to move away from the Johto region. Unlike the Kanto region, it was generally a quiet and peaceful place, despite the annual Pokemon tournament and the occasional criminal. The antics of Team Rocket had been the first threat the region had faced in a few decades, a sign of the fact the region wasn't as prone to crimes as their neighbors. However, concerning the person who had recently moved to the Hoenn region and his connection with one of the most sickening crimes recorded in the Johto region, his reasoning for moving had been understandable.
While the exact role this trainer played in this crime is unknown, he was related to the criminal as the man's son.
Vincent Richard Hagi was a renowned scientist, well-known for his research and discoveries concerning the relationship between the DNA of Pokemon and Humans. After several years of research, he came to conclusion that it was possible to take DNA from a Pokemon and implant it into that of a young human child. Attempt after attempt failed, and finally, after discovering the discarded bodies of the children he had used, he was charged for a crime against humanity. Ultimately, however, he vanished, never to be seen again.
The whereabouts of his son had been unknown for several years following his disappearance as a toddler. Though he had not been found among the dead, investigators assumed he had died along with the other children Vincent had experimented on. However, more than half a decade later, a Trainer stumbled upon the missing child out in the wilds of Mt. Silver, living with a small family of Ursaring and Teddiursa. The Nurse Joy residing at the base of the mountain took up his reintroduction to society, and so began a rough year of teaching the boy how to once again live among the humans.
It wasn't until age fifteen that Shu Hagi decided to become a Pokemon Trainer. It was at this time that Team Rocket first began running their operation in the Johto region. Lightning Yumachi, a Trainer hailing from the Kanto Region, had traveled to the Johto region at this time to begin a new journey. The two first met in Celadon, ready to challenge the gym. They became fast friends, traveling together.
After successfully stopping Team Rocket with the help of Gold and his rival Silver, Lightning went on to challenge the Indigo League, successfully beating the Elite Four and becoming the champion. It was soon afterwards that Shu ultimately moved away to the Hoenn region, seeking a quiet life.