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I believe you get those automatically after recruiting those Pokemon. Also, the Regis are in the Broken Relic as bosses on Floors 15, 25, and 35. Make sure you have the friend area for Baltoy because they stay there.
in order to recruit the regis you need the friend area "Ancient Relic' and you must have the "Rock part" (for regirock) the "ice part" (for regice" and the "steel part" (for registeel). you can have the item in your bag or you can have the music box in your bag to recruit them.