Megadimension Neptunia VIIR - Where to find cpu's nightwear outfits

For the longest time had no idea where to find these. Couldn't find any guides on how to get them either. Spent hours on opening lottos & doing rank grinding for gear. None of that seems to ever work. Anyways it seems the only way to obtain their outfits is fighting in the rush battles. There's no plans for them, only drops. "Metal rush" will be your best chance since it offers all cpu equipment.