wotc pokemon booster box Base Set - Resealed? - Question Pokemon 1999 Base Set Unlimited

If you are struggling to find one, you are not alone it is widely considered the Gatekeeper of the 151 Master Set

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If the Defending Pokemon is an Evolution Pokemon, it can't attack during your opponent's next turn

For example, it's virtually impossible to amass a complete run of trophy cards from every World Championship tournament