From Bulbapedia, the community-driven Pokémon encyclopedia.
Peril Cliffs (Japanese: イノチがけ Inochi Cliffs) is an area in Pokémon Ranger: Shadows of Almia.
The Peril Cliffs are an extremely dangerous set of cliffs to which access is usually forbidden. Rare plant life and many kinds of wild Pokémon can be found here. The cliffs are located halfway along Union Road. The player first comes here with Barlow to discover the cause of some earthquakes. They encounter a Team Dim Sun member trying to dig a tunnel using two Rampardos and must capture one of them. The other is taken on by Barlow.