Look past the front-of-card pokemon and Umbreon is there — 7 times across the TCG, drawn between 2003 and 2024. Hitoshi Ariga, Kagemaru Himeno and aspara's work shows up most often.
These cameos cluster in XY Black Star Promos most heavily; Hitoshi Ariga accounts for 2 of the appearances.
These cards feature indoor, indeterminate, city and abstract background in their background art, illustrated by artists like Hitoshi Ariga, Kagemaru Himeno and aspara.
Umbreon appears as a background cameo across 7 Pokémon cards.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2003–2024 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.