evolving skies booster box tcgplayer Pokemon: Sword & Shield: Shield—Evolving Skies booster box contains 36 booster packs Evolving Skies Half Booster Box

Community estimates place them at roughly 12 per case (12 Japanese boxes)

There are a couple of rules you should always be aware of

While a handful of cards that are particularly funny, reference iconic old cards, or are somehow useful in real life (like Ashnod's Coupon or Richard Garfield, Ph.D.) might have a little value, you'll be cracking packs of Unstable for the jokes and novelty, rather than in the hopes of opening a valuable rare

You can treat a learn card as a card that has some minor value effect like draw a card or create a token that can tutor for a lesson card from your sideboard

They also appear on the Original 95 Topsun Holo set (see point 3)