Riolu is card #91 of 127 in Platinum (2009), a Common illustrated by Kouki Saitou. At about $19.10 it is the #43 most valuable card in the set. In a Platinum booster it turns up about once every 9 packs. It is one of 32 Riolu cards printed so far.
2007Diamond & Pearl
2009Platinum
2012Next Destinies
2016Fates Collide
2018Ultra Prism
2020Vivid Voltage
2024Paldean Fates
2026Ascended Heroes

















See the full Platinum card list
An ungraded Riolu from Platinum sells for about $19.10. A PSA 10 is worth more, roughly $153 by our estimate, and a PSA 9 around $53.48.
It is a Common, and it shows up about once every 9 Platinum packs.
Kouki Saitou drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Platinum 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.