I was having the same issue yesterday and I did the mentioned method and it completely fixed my problem. But early this morning it started happening again. Don't know what to do.
I just got a notification for an alpha swarm near victory road, I swept through the victory road twice but I can't even see a single Pokemon. What to do?
I tried this but it's not working, also, is there any other way to evolve a graveler without trading, I don't know how to trade and I've got a good graveler and also a good kadabra which I don't wanna trade