Riolu shows up as a background cameo across 1 Pokémon card. These appearances span 2018, illustrated by tetsuya koizumi.
These cameos cluster in Lost Thunder most heavily; tetsuya koizumi accounts for 1 of the appearances.
These cards feature sarcophagus, shadowy_arms, red_eyes and grinning in their background art, illustrated by artists like tetsuya koizumi.
Riolu appears as a background cameo across 1 Pokémon card.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2018 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.