Chansey is card #20 of 115 in Unseen Forces (2005), a Rare illustrated by Yukiko Baba. At about $76.49 it is the #39 most valuable card in the set. In an Unseen Forces booster it turns up about once every 70 packs. It is one of 25 Chansey cards printed so far.
1999Base Set
2003Ruby & Sapphire
2005Unseen Forces
2010HeartGold & SoulSilver
2014Phantom Forces
2018Lost Thunder
2021Fusion Strike
2024Twilight Masquerade

















See the full Unseen Forces card list
An ungraded Chansey from Unseen Forces sells for about $76.49. A PSA 10 is worth more, roughly $994 by our estimate, and a PSA 9 around $306.
It is a Rare, and it shows up about once every 70 Unseen Forces packs.
Yukiko Baba drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Unseen Forces 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.