Usually a little offensive pressure is enough to check hera and haxorus. Scarf hydreigon is a fantastic check to both of them by easily RK. But, straight up countering is hard since +2 can easily take out even dedicated walls for both mons. But, they have to set up and thats where you usually run into problems. Full stall cant stop them from setting up, so their only amswer is to tank the hit and roar or check with a fairy.
Semi stall is definitely viable in the current meta. Some stalliness with wallbreakers. I ran semi stall on my latest dark horse team (granbull, crobat, umbreon, pangoro, seismitoad and cresselia). My original team was too passive and couldnt do much to the opponent, but once i added CB Pangoro and SubCM Cress, it gave it enough oomf to finally work.
Semi stall is definitely viable in the current meta. Some stalliness with wallbreakers. I ran semi stall on my latest dark horse team (granbull, crobat, umbreon, pangoro, seismitoad and cresselia). My original team was too passive and couldnt do much to the opponent, but once i added CB Pangoro and SubCM Cress, it gave it enough oomf to finally work.