Volcanion #XY185 from XY Black Star Promos is a reverse holo promo card that currently sells for about $10.78 ungraded, with graded copies ranging from $43.70 at grade 9 to $285 at grade 10. A grade 10 copy sells for around $285, about 26× the $10.78 raw price, so high-grade copies are worth grading.