The Pokémon TCG hides Mareanie in the background art of 1 card. The cameos sit across 2023, with You Iribi responsible for several of them.
Of the 1 card, Scarlet & Violet contributes the largest cluster. The illustrator most often responsible is You Iribi, whose Mareanie cameos appear in 1 of these cards.
These cards feature underwater, swimming, aquatic_plants and splash in their background art, illustrated by artists like You Iribi.
Mareanie appears as a background cameo across 1 Pokémon card.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2023 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.