The Starmie (30 / 144) card can be found in the Skyridge set.
Recently sold 2 times and based on those sales is worth around £31.42.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £24.55 to £38.29, making it quite stable.
This Rare card was illustrated by Hajime Kusajima.