3 Pokemon Base Set Black Triangle Error Sealed Booster Packs READ DESCRIPTION!!! #1692658622 1999 Base Set Black Triangle Error Booster Pack Set PSA 10 The very first expansion to be released for the Pokmon TCG was Base Set (Expansion Pack in Japan), and in front If you happen upon an unopened #Pokemon pack and notice a little black triangle on the bottom right, then it's your lucky day. Those packs are known as "Black Triangle Errors" and Sealed Unweighed Pokemon Base Set Black Triangle Booster Pack Charizard Art eBay