The Dark Donphan (3 / 105) card can be found in the Neo Destiny Unlimited set.
Recently sold 9 times and based on those sales is worth around £16.58.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £8.35 to £24.81, making it quite stable.
This Rare Holo card was illustrated by Shin-ichi Yoshida.