Great Legend booster box contains 24 packs and 1 of 6 promo cards (box topper).
Each pack contains 12 cards.
With each box purchase, you will receive 1 Great Legend Power Up pack which contains 2 of 6 promo cards.
With each box purchase, you will also receive 2 Great Dash Pack (Ver. 4)'s which contains 1 of 3 promo cards.
More info here: https://world.digimoncard.com/products/pack/ver4.php