The Pokémon TCG hides Mega Mewtwo Y in the background art of 1 card. The cameos sit across 2015, with 5ban Graphics responsible for several of them.
Of the 1 card, BREAKthrough contributes the largest cluster. The illustrator most often responsible is 5ban Graphics, whose Mega Mewtwo Y cameos appear in 1 of these cards.
These cards feature energy_ring, space_background, starry and sparkling in their background art, illustrated by artists like 5ban Graphics.
Mega Mewtwo Y appears as a background cameo across 1 Pokémon card.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2015 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.