Tentacruel is card #H26 of 147 in Aquapolis (2003), a Rare Holo illustrated by Hajime Kusajima. At about $174 it is the #32 most valuable card in the set. In an Aquapolis booster it turns up about once every 84 packs. It is one of 16 Tentacruel cards printed so far.
1999Fossil
2001Southern Islands
2003Aquapolis
2006Legend Maker
2008Legends Awakened
2015Primal Clash
2019Unbroken Bonds
2023151

















See the full Aquapolis card list
An ungraded Tentacruel from Aquapolis sells for about $174. A PSA 10 is worth more, roughly $2,261 by our estimate, and a PSA 9 around $696.
It is a Rare Holo, and it shows up about once every 84 Aquapolis packs.
Hajime Kusajima drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Aquapolis 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.