tcg darkness ablaze booster box Sword & Shield—Darkness Case(6 Boxes) Which Pokémon will you find inside? Pokemon: Darkness Ablaze Booster Box

Id say thats more than enough grounds to call it official

Those cards were strong enough in the early meta that their counters had a feasible reason to exist in an opponent's Deck

Rage of the Abyss core booster set looks like this: 10 Secret Rares 14 Ultra Rares 26 Super Rares 50 Commons (24 of these cards are also available as Quarter Century Secret Rare and 1 special card is ONLY available as a Quarter Century Secret Rare!)

You can only use this effect of "Adularia of the June Moon" once per turn

These cards are not legal in Standard or Explorer, but will be legal in Alchemy, Historic, and Historic Brawl

Yes, the inherited effect activates for each of the 2 Digimon, so the digivolution cost increases by a total of 2