The Pokémon TCG hides Vivillon in the background art of 1 card. The cameos sit across 2013, with Naoki Saito responsible for several of them.
These cameos cluster in XY Black Star Promos most heavily; Naoki Saito accounts for 1 of the appearances.
These cards feature water, Lapras boat, cityscape and blue sky in their background art, illustrated by artists like Naoki Saito.
Vivillon appears as a background cameo across 1 Pokémon card.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2013 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.