The Gyarados (H10) card can be found in the Skyridge set.
Recently sold 1 times and based on those sales is worth around £103.75.
Currently, there is 1 open listing for this card on ebay.
This card sells in the range of £103.75 to £103.75, making it very stable.
This Rare Holo card was illustrated by Kimiya Masago.