Notes:

-8 Landorus-T
-6 Mega Kangaskhan (75% of the Megas)
-6 Heatran
-6 Amoonguss
-5 Cresselia
-4 Thundurus
-3 Aegislash
-2 Tyranitar
-2 Mega Gardevoir (25% of the Megas)
-1 Hydreigon
-1 Rotom-W
-1 Volcarona
-1 Sylveon
-1 Entei
-1 Scrafty

4 of those teams that are the exact same (Kangaskhan, Heatran, Landorus, Amoonguss, Cresselia)

I don't know but this feels like Smogon OU but without Garchomp.