With this team i can make my gym run in 1 hour and 30 minutes.
1> (Ace) Krookodile (moxie) Moves ( Earthquake / Rock Slide / Crunch / Dragon Claw) Soft Sand item. Nature i use Jolly with 252 evs in attack and speed
2> (Sup for krok to deal some damage) Charizard, Moves: (Heat Wave / Air cutter / Dragon Pulse ) Item: Wide lens(help with acc). Nature i use Timid with 252 evs in spatt and speed
With this two you can combine EQ and Heat wave/Air Cutter ( heat wave and air cutter helps krook to faints mostly mons and get a buff from Moxie)
3/4> (Sweeper when Krook or Charizard faints) 2x Gengar, Moves: (Sludge Wave / Shadow ball / Thunderbolt / Giga Drain) Item: Life orb. I use Timid nature with 252 evs in spatt and speed.
With this two you can use they with Krook, they have levitate, and they will hit hard and help a lot with couverage moves :)
5> (Help in rain teams) Special Kingdra,(Swift swim) moves: ( Surf / Hydro pump / Dragon pulse / Ice beam) item: CHSpecs. I run Modest nature with 252 evs in spatt and speed
6> Use a fast fighting of your preference, it will help you with Chansey and blissey when your krooko faints) I usually use Lucario with close combat