The Gyarados (H10) card can be found in the Skyridge set.
Recently sold 5 times and based on those sales is worth around £100.00.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £21.61 to £178.39, making it highly volatile.
This Rare Holo card was illustrated by Kimiya Masago.