The Leafeon V (167 / 203) card can be found in the Evolving Skies set.
Recently sold 32 times and based on those sales is worth around £47.98.
Currently, there are 11 open listings for this card on ebay.
This card sells in the range of £38.30 to £57.66, making it quite stable.
This is a Rare Ultra card.
The fact that it is a V card makes it one of the more valuable cards.