Here one more error variant I’m aware of for the unlimited edition Holofoil version. They forgot to apply the solid black layer by the looks of it, causing everything to appear grey instead:
Some more examples for other Team Rocket cards with this misprint in this thread, so it’s not a one-time occurrence: www.elitefourum.com/t/are-theses-cards-missprint/24848/1
Also, here a video by @pkmnflyingmaster about how Pokémon cards are printed and how certain misprints can occur. With this misprint above, the solid black layer seems to be missing:
EDIT: It might actually also be possible the black ink was simply running low, since the artwork itself is lacking black as well, which wouldn’t have a solid black layer applied later on a.f.a.i.k.
Greetz,
Quuador