Aggron is card #1 of 123 in Mysterious Treasures (2007), a Rare Holo illustrated by Kouki Saitou. At about $19.22 it is the #23 most valuable card in the set. In a Mysterious Treasures booster it turns up about once every 55 packs. It is one of 24 Aggron cards printed so far.
2003Ruby & Sapphire
2006Crystal Guardians
2007Power Keepers
2009Rising Rivals
2012Dragons Exalted
2017Crimson Invasion
2020Darkness Ablaze
2022Brilliant Stars

















See the full Mysterious Treasures card list
An ungraded Aggron from Mysterious Treasures sells for about $19.22. A PSA 10 is worth more, roughly $154 by our estimate, and a PSA 9 around $53.82.
It is a Rare Holo, and it shows up about once every 55 Mysterious Treasures packs.
Kouki Saitou drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Mysterious Treasures booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.