The Dialga (SL2) card can be found in the Call of Legends set.
Recently sold 3 times and based on those sales is worth around £48.99.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £44.21 to £53.77, making it stable.
This Rare Holo card was illustrated by Ayaka Yoshida.