ALL SOLD Base Set 'Black Triangle Error' Booster Packs from 1999 have left our stores and now reside with their new happy owners! 1999 Sealed Pokemon Base Black Triangle Packs TikTok Sealed Unweighed Pokemon Base Set Black Triangle Booster Pack Charizard Art eBay 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 PSA 10 GM MINT 1999 POKEMON BASE SET BOOSTER BLACK TRIANGLE ERROR PACK CHARIZARD Pokemon Cards BASE SET Booster Pack (11 cards) Blastoise Artwork Factory Sealed & Mint