op-05 booster box tcgplayer Amazon.com: BANDAI NAMCO Entertainment One Piece Trading Card Game Awakening of the New Era [ENGLISH, 24 Packs] : Toys & Games Build decks with new themes Double Pack Set Volume 2

The Twin King, Founders Of The Empire is a rare collector's item if you can get your hands on it

Nostalgia likely drives the high value of vintage Pokmon cards, as they represent a cherished part of childhood

"Portable monsters and commodity cuteness: Pokmon as Japan's new global power" (PDF)

As you pointed out, the difference between Pokmon EX and Pokmon GX is that the former ones are always Basic whereas the latter ones are always the stage they are supposed to be [1] (except for Tag Team GX cards which are also always Basic)

Includes all 15 cards pictured: Psyduck 028/189 Mesprit 079/191 Victini 030/162 Eevee 054/078 Bidoof 059/078 Oddish 001/159 Tangela 004/159 Pikachu 049/203 Flittle 079/182 Flittle 068/142 Bidoof 111/159 Aron 109/198 Stufful 150/264 Vulpix 017/195 Morpeko 035/072 Perfect for collectors, binder collections, Pokdex builders, and cute Pokmon lovers