Mount Engird - Pokémon Monochrome OST 

Composed and arranged by Kosmid
The great Engird Mountain is an iconic part of the Prairie Province that happens to circle the humble town of Arienstein. With no way over or around it, the only way you can get to the town is trekking through the inner caverns of the towering Mountain. Dark and damp, the caves are known to hold rare but unpredictable Pokémon.