pokemon prismatic evolution card pack Pokémon Evolutions Booster - Scarlet & Violet SV8.5 The colourful The Prismatic Evolutions God Pack

They include Black and White, Emerging Powers, and Boundaries Crossed

It is also why black is the most common colour alongside blue in legacy and vintage where you need to have some interaction with spells and their potential to be cast so as to not get run over by broken things

As for the badges theory, I checked and some of my 2000 ones are also yellowed while others are white

They basically act as a substitute for a card from that pack in the equivalent rarity

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You can now have a retreat cost of up to 6