Just wondering if there's a list for all hordes in ORAS, specifically the ones where only one Pokemon horde take up that area (Ex. Shuppet @ Mt. Pyre).
Here is a link to all the horde battles in OrAs including hordes that only have one kind of Pokemon. Although this list does include all the hordes from X and Y so you'll have to scroll down to find the hordes from OrAs
Hope I helped.
