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Any tips on getting "ambush" spots to appear more frequently in the outside areas of Victory Road? I assumed it was like the shaking grass of Gen. 5 where the time between each spot appearing was random but that doesn't seem to be the case for me. I may just have terrible luck.
When searching for Audino I managed to get a shaking bush to occur every time I left the area then came back, but it doesn't seem to work that way for the ambush spots when looking for Skarmory/Hydreigon.