Pokémon cards come in all different designs, styles, move sets, and artwork. If you don't know what you're looking at (or even if you do) you will probably notice the Pokémon card colors are different between them. There are quite a few different colors and they can vary pretty drastically based on the set that they belong to.
I always wonder why different colored code cards signify whether or not a pack has a "hit" in it (ex. black Vs white border in recent sets), it feels like it spoils the fun. I know you can open packs a certain way to not see the color of the card but sometimes code cards face different ways depending on the sets so it's easy to spoil.
The Pokémon TCG, as we all know, uses code cards to unlock online content. These aren't just randomly assigned colors; they correlate to the weight of the pack. This is a fascinating bit of behind-the-scenes info most players don't know.
White code cards indicate a lighter pack. Why? The code is on the side not pictured. Note the different color from the English version.
Code cards are Pokémon Trading Card Game cards containing codes that can be used to redeem virtual cards or other virtual products for Pokémon TCG Live and its defunct predecessor, Pokémon Trading Card Game Online. It is not the code cards that determine the pulls but the pack contents determining which code card you get. The two different types of code cards (each with slightly different weights) were created to make weighing packs harder.
As a long-time Pokémon TCG collector, this is one of the most common questions I get from new fans eager to understand the different card colors and symbols that denote rarity levels. And for good reason - understanding Pokémon card rarity helps collectors assess their pulls, chase rare cards, and maximize the value of their collections. A black lined code means that the pack will have a holo or higher and a white lined code means that you will get a regular rare.
Of course because of the terrible quality control they seem to mess this up sometimes. The green code cards weigh more than the white ones to prevent weighing packs. However, regardless of a code's color you can still get a hit if it occupies the reverse holo slot as opposed to the rare slot.
It isn't a superstition it is just something the pokemon company has been doing for the last 5 or so years. A community for players of the Pokemon Trading Card Game to show off pulls and discuss the game. White code cards means holo rare or better (ultra, rare, full art, or secret rare).
Pokemon's quality control has been pretty bad lately so i've seen packs with green codes have holos and vice versa.