Route 455

Route 455 was originally a proposed railway expansion in the 1890s — historical Council Bluffs was a railroad hub connecting the American frontier. The project was abandoned when workers unearthed something impossible...

A sleeping Hippowdon the size of a city block. It remains buried beneath the ridge crest to this day, occasionally shifting in its sleep, causing the "tremors" that reshape the route's terrain each season.

Locals call it "The Great Below One" — not hostile, but approachable only via a post-game sidequest involving feeding it 100 Sitrus Berries, after which it becomes a stationary raid boss.

— Excerpt from "Field Notes of Route 455" by Prof. Loess, Omaha Pokémon Research Lab