detrus

So im on the newest version of all gen and reborn and currently on tier 4 but for some reason ogerpon hasn't spawned for me in ametrine the old man tells me that theres a silhouette near the hotel but there is nothing spawning also for some reason I was table to do the zacian quest while I was on tier 3 but it is meant for tier 6 is there any solution to this problem? Sorry for the big paragraph