The numbering is interesting. Based on the info we know every Pokémon will get a AR or SAR, Serperior ex sar is 169, while reshiram and zekrom are both 174. I assume at least 6 ex's per set so probably it's like 173 is the sar of them both, and 174 the bwr. So 175 should be a ex sar, or am I...