Hoopa #XY147 from XY Black Star Promos is a reverse holo promo card that currently sells for about $10.00 ungraded, with graded copies ranging from $17.50 at grade 9 to $4.75 at grade 10. A grade 10 copy sells for around $4.75 vs $10.00 raw. That's a modest premium, so grading only pays off for near-perfect copies.