Acerola's Mischief #183 from Mega Evolution is a holo illustration_rare card that currently sells for about $31.69 ungraded, with graded copies ranging from $21.83 at grade 7 to $55.00 at grade 10. A grade 10 copy sells for around $55.00 vs $31.69 raw. That's a modest premium, so grading only pays off for near-perfect copies.