Klefki seems really good due to the number of dark types (bisharp, t-tar, weaville) in the meta-game and the difficulty of hazard control. A lot of the pokemon used on offense to remove hazards (the latis, starmie) are psychics and the sheer number of dark type knock off and pursuit users makes their life difficult(though latios and latias are still very strong, they just have more trouble removing hazards from my experience). I wouldn't run more than one psychic mon on a team for sure. Balanced is really underrated because a lot of the same offensive threats (keldeo, bisharp, latios) are being run on every other team so a well-built balanced team with answers to those threats (as well as Landorus-i) can be very successful. Stall is almost non-existent from my experience (am top ten on ladder but haven't faced one) but over time I think people will build stall teams that can handle threats like Landorus-i and Terrakion efficiently while dealing with hazard control without mega-sableye.