I don't feel too bad about bumping this since it's a new, diverse, metagame and there should be a lot of new combos. Also, the only thread anyone is using seems to be the megathread, so maybe this thread can take some pressure away from there. This is a much better place for, "hey guys I used this!" than the megathread. Anyway, this is a combination I've been using.
Offensive Combination
Aggron @ Choice Band
Ability: Rock Head
EVs: 4 HP/252 Atk/252 Spe
Nature: Jolly
-Head Smash
-Aqua Tail
-Low Kick
-Ice Punch
-and-
Torterra @ Life Orb
EVs: 4 HP/252 Atk/252 Spe
Nature: Adamant
-Rock Polish
-Wood Hammer
-Earthquake
-Stone Edge
The basic premise of this combo is that CB Aggron can tear apart Stall teams, while Rock Polish Torterra can sweep offensive teams; both are useful at some point against more balanced teams, so this way you have a good plan against a variety of play styles. Generally, you want to reveal Aggron (not on a U-turn!) first, and try to weaken the opponent's team so that Torterra can sweep. Aggron is great at luring and taking out Donphan, Weezing, Slowbro, and bulky Grass-types, which can cause problem's for Torterra's sweep. Torterra can also weaken bulky Fighting-types, who are the only pokemon that can reliably stand up to CB Aggron without prediction. Torterra can also set up Rock Polish on Dugtrio who have just revenged Aggron, which is usually very bad news for the types of teams that carry Dugtrio. Neither one is too worried about Milotic, which is great in this metagame.
This combo needs help from some kind of defensive core or plan, or else you will get eaten alive by faster teams, or find yourself having to sack Aggron almost immediately. The two most problematic pokemon are probably: Intimidate Hitmontop, who walls Aggron and weakens Torterra, and Sceptile, who can revenge kill a +2 Torterra or Aggron, and is not likely to be hurt by Aggron unless your opponent intentionally sacks it. Heal Bell support can be pretty helpful, since many players will try to Paralyze or Burn Aggron at great cost to whatever is dishing out Status.