The Psyduck (104 / 147) card can be found in the Aquapolis set.
Recently sold 1 times and based on those sales is worth around £35.89.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £35.89 to £35.89, making it very stable.
This Common card was illustrated by Keiko Fukuyama.