The Groudon EX (150 / 160) card can be found in the Primal Clash set.
Recently sold 9 times and based on those sales is worth around £10.51.
Currently, there are 15 open listings for this card on ebay.
This card sells in the range of £2.76 to £18.26, making it quite stable.
This Rare Ultra card was illustrated by 5ban Graphics.
The fact that it is a EX card makes it one of the more valuable cards.