The magnet in Nosepass's nose provides an unerring compass, making this Pokémon an excellent partner for Trainers going on a journey.
When endangered, it may protect itself by increasing its magnetism and drawing nearby iron objects to its body.
Once the people of Hisui discovered that its red nose always points north, they grew to rely on it greatly when traveling afar. The nose seems to work in a similar way to ancient compasses.