This reverse holo comes from Black & White—Boundaries Crossed, where the official set checklist shows Psyduck appearing twice in the expansion at #32 and #33, giving collectors two different Psyduck slots to chase in one BW-era set.

Boundaries Crossed is the English release tied to Japan’s Cold Flare expansion, and Bulbapedia specifically lists Psyduck (Boundaries Crossed 33) as part of that Cold Flare lineage, which gives this common a direct connection to a Japanese split-era release.