The Gyarados (11 / 144) card can be found in the Skyridge set.
Recently sold 1 times and based on those sales is worth around £99.92.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £99.92 to £99.92, making it very stable.
This Rare card was illustrated by Kimiya Masago.