The Nidoking (150 / 147) card can be found in the Aquapolis set.
Recently sold 3 times and based on those sales is worth around £130.00.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £55.00 to £205.00, making it highly volatile.
This Rare Secret card was illustrated by Hironobu Yoshida.