You might even get your hands on a Terapagos ex-SIR, one of the rarest in the set and a real showstopper in battle
Collectors aiming for a master set will need four variations of every Common, Uncommon, and Rare card
C Common Background Dragon X DARK Level 5 [ DragonEffect ] ATK 1600 DEF 1800 If this card is in the GY and you control no cards: You can Special Summon both this card, and 1 Level 4 or lower Dragon monster from your hand, in Defense Position, but banish this card when it leaves the field
This will mark the first time a dual set has been released in English in the history of the Pokemon TCG
Apparently these boxes were only given to Pokemon employees that had started working at the company before/during the release of Generations, on top of that they arent allowed to sell product while working for the company so because of this theres only an estimated 150-200 boxes in existence (not to mention the ones people have already opened, one of the employees told me he already cracked his not knowing it could be worth anything substantial)
Even the Evolving Skies booster packs and ETBs can be tricky to track down