The Dragonite GX (248 / 236) card can be found in the Unified Minds set.
Recently sold 6 times and based on those sales is worth around £24.74.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £13.08 to £36.40, making it quite volatile.
This Rare Rainbow card was illustrated by ConceptLab.
The fact that it is a GX card makes it one of the more valuable cards.