^ I understand that it is a possibility that solo Regirock can happen, but the statistics shown from most of my own personal testing proves that the odds of it occurring are massively unlikely. (4 Magnemite/4 Spiritomb/2 Regi/1 Azelf/1 Unown Q/1 Skuntank G/etc) I think I've only had maybe one game out of like 15-20 games in which this happened, and I was still able to get at least to a warp energy. (I also run 4 Warp Energies in my deck, if that tells you anything)
I'll take the risk. Call really doesn't help you that much with as consistent an engine as this deck has.