Tentacool is card #70 of 160 in Primal Clash (2015), a Common illustrated by Yukiko Baba. At about $0.66 it is the #121 most valuable card in the set. In a Primal Clash booster it turns up about once every 7 packs. It is one of 16 Tentacool cards printed so far.
1999Fossil
2002Legendary Collection
2003Aquapolis
2006Legend Maker
2010HS—Triumphant
2015Primal Clash
2017Guardians Rising
2019Unbroken Bonds

















See the full Primal Clash card list
An ungraded Tentacool from Primal Clash sells for about $0.66. A PSA 10 is worth more, roughly $3.30 by our estimate, and a PSA 9 around $1.52.
It is a Common, and it shows up about once every 7 Primal Clash packs.
Yukiko Baba drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Primal Clash 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.