Dark Explorers
As mentioned in my last post, Dark Explorers has the same box ratios as Next Destinies. The secret rares have higher pull rates as there are only 3 of them in the set as opposed to 4. The rarity table looks as follows:
And here is the raw data for the holos, rares, Pokémon-EX, full arts and secret rares (dashed lines indicating where the transition from H14 to H13, etc., would occur):
Nothing definitive can be said about individual card rarities.