The Pikachu (DP16) card can be found in the Dp Black Star Promos set.
Recently sold 2 times and based on those sales is worth around £20.04.
Currently, there are 2 open listings for this card on ebay.
This card sells in the range of £18.04 to £22.04, making it very stable.
This Promo card was illustrated by Sumiyoshi Kizuki.