Mt. Coronet (3) Majority of areas — Pokémon Definitive Platinum
Every wild Pokémon here, by encounter method.
Mt. Coronet (3) Majority of areas lists 15 Pokémon across 5 encounter methods (floor, surf, old rod, good rod, and more), between level 10 and 55. One of them is on no other route's wild tables in this guide: Shelgon.
Opens up at 7 badges — Icicle (Candice, Snowpoint City).