Generations of kings were attended by these Pokémon, which used their spectral power to manipulate and control people and Pokémon.
Apparently, it can detect the innate qualities of leadership. According to legend, whoever it recognizes is destined to become king.
In this defensive stance, Aegislash uses its steel body and a force field of spectral power to reduce the damage of any attack.
Its potent spectral powers allow it to manipulate others. It once used its powers to force people and Pokémon to build a kingdom to its liking.
— Pokédex entries (via PokeAPI)