The Blissey (H6) card can be found in the Aquapolis set.
Recently sold 6 times and based on those sales is worth around £34.68.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £18.80 to £50.56, making it quite volatile.
This Rare Holo card was illustrated by Naoyo Kimura.