Soul-Stealing 7-Star Strike is available to Marshadow that learned Spectral Thief, but how to get the Pokemon and Marshadium Z is unrevealed.
Magearna DB: stats, moves, locations & evolution
Fairy-type Pokemon
Noivern DB: stats, moves, locations & evolution
Magnet Pull : Ability
Precipice Blades : Move
Skiploom DB: stats, moves, locations & evolution
Rock Head : Ability