Sometimes, these fake chase cards will also have a brownish, yellowish, or orangish hue to them. In short, they just don’t shine correctly.
And although it sounds odd to hear, fake Pokémon cards-especially chase cards from relatively recent sets-XY onward-tend to have a very simple almost flat holo to them. The worst fakes will print the texture that the card should have instead of reproducing it in the card-making process.
In addition to poor color reproduction and otherwise bad print jobs, fake cards also tend to do a very poor job of mimicking the special holo and texture of the chase cards from the various sets in the Pokémon Trading Card Game.