booster bundle box Scarlet & Violet: 151 Trainer’s Pokemon and Stellar Tera Pokemon ex join returning and newly discovered Mega Evolution Pokemon ex Pokemon Scarlet & Violet 151

Maybe the error wasnt noticed until after some cards were already packaged (though this would imply 1st Edition and Unlimited was being packaged in parallel), or maybe the printing company in some instances discarded some other card instead of Dark Dragonite - not an unheard-of type of error for processes like that

In "The Darksteel Eye", one of the Mirrodin novels, Glissa the elf, Slobad the goblin, and Bosh the giant iron Golem are faced with a blockade of enemies they have to get past

Evidence that cannot be taken away4.5

We have to assume this has resulted in lots of eager Modern players bidding for the cards they need to sleeve up the deck

Looks like it is what it is - a rarity upgrade set with an addition of cheap reprints of meta cards