Across 6 Pokémon TCG cards — drawn 2000–2019 — Onix appears in the background art rather than as the featured pokemon. The cameos rotate through Ken Sugimori, Naoyo Kimura and Keiko Fukuyama and other contributors.
Of the 6 cards, Gym Challenge contributes the largest cluster. The illustrator most often responsible is Ken Sugimori, whose Onix cameos appear in 3 of these cards.
6 cards with Onix in the background spanning 2000–2019, with art by Ken Sugimori, Naoyo Kimura, Keiko Fukuyama and more.
Onix appears as a background cameo across 6 Pokémon cards.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2000–2019 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.