The Nidoking (H18) card can be found in the Aquapolis set.
Recently sold 3 times and based on those sales is worth around £31.00.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £11.51 to £50.49, making it quite volatile.
This Rare Holo card was illustrated by Naoyo Kimura.