The Dewgong (H6) card can be found in the Skyridge set.
Recently sold 2 times and based on those sales is worth around £93.62.
Currently, there are 8 open listings for this card on ebay.
This card sells in the range of £79.09 to £108.15, making it quite volatile.
This Rare Holo card was illustrated by Kouki Saitou.