The Blastoise (137 / 135) card can be found in the Plasma Storm set.
Recently sold 2 times and based on those sales is worth around £122.78.
Currently, there are 9 open listings for this card on ebay.
This card sells in the range of £122.70 to £122.86, making it very stable.
This Rare Secret card was illustrated by Ayaka Yoshida.