The Sun & Moon Black Star Promos were distributed alongside collection boxes and special products during the early years of the Generation VII card game era. These cosmos holo cards represented Pokemon's continued push into modern collecting, with distinctly contemporary design aesthetics that appealed to both players and hobbyists throughout 2017. The promos from this period have become recognized touchstones of the modern hobby's formative phase. Rockruff captures one of the adorable new Rock-type companions introduced in the Sun and Moon games. Collectors are drawn to the early evolution stage Pokémon from this generation for their charm and nostalgic appeal, particularly when rendered in the distinctive cosmos holo treatment that gives these cards their characteristic visual appeal.