Team Aqua's Walrein is card #5 of 34 in Double Crisis (2015), a Rare Holo illustrated by Hitoshi Ariga. At about $2.26 it is the #32 most valuable card in the set. In a Double Crisis booster it turns up about once every 7 packs. It is one of 13 Walrein cards printed so far.
2004Team Magma vs Team Aqua
2006Legend Maker
2009Rising Rivals
2012Dragons Exalted
2014Flashfire
2015Double Crisis
2021Chilling Reign
2024Surging Sparks

















See the full Double Crisis card list
An ungraded Team Aqua's Walrein from Double Crisis sells for about $2.26. A PSA 10 is worth more, roughly $11.30 by our estimate, and a PSA 9 around $5.20.
It is a Rare Holo, and it shows up about once every 7 Double Crisis packs.
Hitoshi Ariga drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Double Crisis 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.