Riolu is card #60 of 95 in HS—Unleashed (2010), a Common illustrated by Kouki Saitou. At about $19.99 it is the #31 most valuable card in the set. In a HS—Unleashed booster it turns up about once every 5 packs. It is one of 32 Riolu cards printed so far.
2007Diamond & Pearl
2009Platinum
2010HS—Unleashed
2012Next Destinies
2016Fates Collide
2018Ultra Prism
2020Vivid Voltage
2024Paldean Fates

















See the full HS—Unleashed card list
An ungraded Riolu from HS—Unleashed sells for about $19.99. A PSA 10 is worth more, roughly $160 by our estimate, and a PSA 9 around $55.97.
It is a Common, and it shows up about once every 5 HS—Unleashed packs.
Kouki Saitou drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open HS—Unleashed 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.