Childhood
They were born in Kalos, but moved to Galar during their high school years. Their home in Kalos was near a large garden that their father maintained, and they spent most of their days playing there. They met their partner pokémon, Budew, in those very gardens! Other than a particular family friend who came to visit (whom they lost contact with when they moved), Budew was their only true friend, and they confided in him about pretty much everything.
It was a rather uneventful childhood. As they got older they spent more time wandering the Kalos region both for school and for fun, but ultimately they always ended up back in the gardens. It was a pleasant rhythm, albeit a bit monotonous, though it was all disrupted when they moved to Galar.
Galar
Galar was very different from Kalos, and they had a pretty hard time adjusting. They met most of their team in Galar, as they wandered around and explored their new home, although for a while, it was a constant cycle of being saved by their pokémon (both for minor things and genuinely dangerous situations). There were no fancy gardens in Galar quite like the one back in Kalos, so they widened their range to the wild area (which is part of the reason they got into trouble so often). Despite the danger, they found great comfort in the openness of the wild area.
They lived in Circhester, but spent a lot of time away from home (mostly in Motostoke and Ballonlea).
Present
Now, present day, they’ve gone beyond the gardens, and even beyond Galar’s wild area. They have made it their duty to travel all around the world and experience as much as they can. Partly out of sheer curiosity, but also because of a letter they got years after they moved… addressed to them, sent from an old friend who they thought had forgotten about them. They’re on a search for this dear friend, and no ocean will stop them from reuniting. At least, that’s what they say when asked about it.
While they never really cared for battling, their pokémon have grown pretty strong on their own. They can fend off anyone challenging them to a fight (unless they have fire types), and that’s all that matters.