The Rayquaza GX (177 / 168) card can be found in the Celestial Storm set.
Recently sold 8 times and based on those sales is worth around £48.04.
Currently, there are 9 open listings for this card on ebay.
This card sells in the range of £24.15 to £71.93, making it highly volatile.
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.