Dialga is card #DP26 of 56 in DP Black Star Promos (2007), a Promo illustrated by Kazuyuki Kano. At about $21.21 it is the #36 most valuable card in the set. It is one of 48 Dialga cards printed so far.
2007Diamond & Pearl
2009Platinum
2011Call of Legends
2014Phantom Forces
2020Vivid Voltage
2022Astral Radiance
2024Surging Sparks
202630th Celebration

















See the full DP Black Star Promos card list
An ungraded Dialga from DP Black Star Promos sells for about $21.21. A PSA 10 is worth more, roughly $170 by our estimate, and a PSA 9 around $59.39.
It is a Promo.
Kazuyuki Kano drew the art for this card.