The Dark Blastoise (4 / 110) card can be found in the Legendary Collection set.
Recently sold 6 times and based on those sales is worth around £144.74.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £88.82 to £200.66, making it highly volatile.
This Rare Holo card was illustrated by Mitsuhiro Arita.