The Gyarados (34 / 108) card can be found in the Evolutions set.
Recently sold 8 times and based on those sales is worth around £4.74.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £2.94 to £6.54, making it very stable.
This Rare Holo card was illustrated by Mitsuhiro Arita.