Up to age 12
Peter never met his real parents. Solox found him as an egg, about to be devoured by an Arbok. Solox defeated the Arbok, evolving in the process, and brought Peter's egg to his old community in Relic Forest. Peter was raised by the collectictive members of the community, most notably Solox and Nana. His childhood had its ups and downs. He was always loved and respected. He was sheltered from things like violence and grief, and he was often spoiled. But at the same time, Peter never had much freedom under his authoritarian upbringing. He was forced to hide whenever a stranger entered the community, he could never go anywhere without supervision, and he was prohibited from time-traveling until he reached the age of 13. Peter's curiosity urged him to break the rules at times. But his obedience and shyness usually won out. He never did time travel until age 13. Other than a certain episode where Relic Forest was torched, he lived a peaceful childhood.
Age 13
Peter time-traveled for the first time on his thirteenth birthday. He was still shy and naive, and had no clue what to do with his new start in life. So he chose to travel to about a week in the future so he could ask his future self what to do. Instead of finding his future self, Peter got the shock of his life. He discovered a grave near Relic Forest. The tombstone clearly marked it as his own grave. And it included the date of death: the day after Peter's thirteenth birthday. Since then, Peter has been terrified of his "expiration date", and has never yet traveled to it.
Near the end of his thirteenth year, Peter attempted to purify a shadow pokemon for the first time. With no prior experience, Peter failed, nearly dying in the process. A 23-year-old version of himself rescued him. The older self gave him a negative and mildly insane pep talk...but young Peter interpreted it as an uplifting speech to change the world and live life to the fullest.
