The Dark Slowking (9 / 109) card can be found in the Team Rocket Returns set.
Recently sold 1 times and based on those sales is worth around £58.00.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £58.00 to £58.00, making it very stable.
This Rare Holo card was illustrated by Kouki Saitou.