The Zygarde GX (136 / 131) card can be found in the Forbidden Light set.
Recently sold 1 times and based on those sales is worth around £17.98.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £17.98 to £17.98, making it very stable.
This Rare Rainbow card was illustrated by 5ban Graphics.
The fact that it is a GX card makes it one of the more valuable cards.