Sentret is card #107 of 147 in Aquapolis (2003), a Common illustrated by Hizuki Misono. At about $42.49 it is the #118 most valuable card in the set. In an Aquapolis booster it turns up about once every 9 packs. It is one of 11 Sentret cards printed so far.
2000Neo Genesis
2001Neo Discovery
2003Aquapolis
2004Team Rocket Returns
2006Legend Maker
2008POP Series 7
2010HeartGold & SoulSilver
2020Darkness Ablaze

















See the full Aquapolis card list
An ungraded Sentret from Aquapolis sells for about $42.49. A PSA 10 is worth more, roughly $552 by our estimate, and a PSA 9 around $170.
It is a Common, and it shows up about once every 9 Aquapolis packs.
Hizuki Misono 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.