Across 1 Pokémon TCG card — drawn 2000 — Gloom appears in the background art rather than as the featured pokemon. The cameos rotate through Ken Sugimori and other contributors.
Of the 1 card, Gym Heroes contributes the largest cluster. The illustrator most often responsible is Ken Sugimori, whose Gloom cameos appear in 1 of these cards.
These cards feature hands, bottle, green and purple in their background art, illustrated by artists like Ken Sugimori.
Gloom appears as a background cameo across 1 Pokémon card.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2000 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.