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 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 Rare black triangle error pack!! : r PokemonTCG Any advice on collecting all of silver tempest? I bought my first ever booster box and I decided to collect the set after pulling the alt art lugia. Is it much harder 1999 Pokemon Base Set BLACK TRIANGLE 1st Edition Error Booster Packs (x3) MINT Sold for $3,000.00 Pokemon Price Reference Booster Pack Prices Pokemon Silver Tempest Pokemon Cards