We don't know if Marshtomp is a POTD. I don't think that they would put a random POTD that's not even from the current gen on a poster where everything else on it as a main character's Pokemon, a super popular Pokemon, a Pokemon from the current gen, a Legendary Pokemon, or a combination of these.
Marshtomp is an anomaly on the poster. It's the only Pokemon on there that's not a super popular Pokemon, a Galar Pokemon, a Pokemon owned by a main character, a Legendary Pokemon, or a combination of these. Yamper is also mysteriously shown with Ash's Pokemon, which I think is a placeholder for...
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