I was watching TV, because I'm lazy, and it said examples:
Krookodile EX(it didn't say Krookodile EX but it still was an example)
WHY... is Kyogre in the deck?
Because the set contains 211 cards. And, I'm pretty sure that there isn't 211 dark types in B/W to go around. So they just threw the extra cards in.
But, I'm no TCG expert.
Hope This Helped :D