The Nidoqueen (H21) card can be found in the Skyridge set.
Recently sold 4 times and based on those sales is worth around £77.69.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £52.00 to £103.38, making it highly volatile.
This Rare Holo card was illustrated by Mitsuhiro Arita.