All cards are originals, no proxies or fakes
The new theory presented by @pokemonrevolution suggests sheets are stacked on top of each other before the 1st edition stamp ink was dry, causing both the imprints at the back of the cards, as well as the Grey stamps
However, there are some other places where you can make money: Here are a few options: Other Online Platforms
Given that Dragapult is such a relatively new Pokemon that hasn't featured in many generations, it's no surprise that some of the most expensive cards are from its debut sets
To maximize its utility and reduce the impact of the effects drawback, the player should only activate it in the mid-game at the earliest unless the player already has DON
these values also regional forms (Alolan Meowth, etc) which can be found in the wild and/or evolve normally from a normal Pokmon and are therefore considered just as official