Look past the front-of-card pokemon and Sudowoodo is there — 3 times across the TCG, drawn between 2003 and 2010. Kagemaru Himeno and Kanako Eo's work shows up most often.
Of the 3 cards, Aquapolis contributes the largest cluster. The illustrator most often responsible is Kagemaru Himeno, whose Sudowoodo cameos appear in 1 of these cards.
3 cards with Sudowoodo in the background spanning 2003–2010, with art by Kagemaru Himeno and Kanako Eo.
Sudowoodo appears as a background cameo across 3 Pokémon cards.
These appearances range from clear sightings to barely-visible silhouettes, scattered across 2003–2010 of the TCG.
Each cameo rewards collectors who pause to look closely at the card art.