The Houndoom (15 / 147) card can be found in the Aquapolis set.
Recently sold 3 times and based on those sales is worth around £13.61.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £8.45 to £18.77, making it quite stable.
This Rare card was illustrated by Hajime Kusajima.