Location from pokemon-horizons by
The origin region of Pokémon canon — in Horizons, the home of Indigo Academy, Roy's unnamed island, and Orla and Friede's shared childhood.
Kanto in Horizons is less a frontier and more a backdrop. Roy's island lies off its coast; Indigo Academy sits on a wooded hillside inland; Vermilion's port is where the Brave Asagi occasionally docks for supplies. The region carries the weight of everything that happened before — Ash's journey, the League, the original research — but the current story rarely dwells there.
Rolling green countryside, quiet port towns, dense deciduous forests, the iconic Route 1 running from Pallet toward Viridian, and the light industrial sprawl around Vermilion City. Weather is mild; the sky is the kind of pale blue tourists always associate with first journeys.