Booster packs come with a mix of common cards, uncommon and one rare or higher in each pack. With so many rare card types (EX, Mega EX, standard, secret, holo, reverse holo, Break, full art, GX, Tag Team GX, etc.) it is not uncommon to not receive a specific card or card type in many packs. The number of cards in each set can also change what can be pulled.
While we do guarantee the above in each booster pack, we do not have a specific ratio or pull rate for entire booster boxes. While you may have had one experience with booster boxes previously, there are no guaranteed specific higher than rare cards or card types included in each booster box.