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I tend to rotate my team a lot to throw people in my circle off guard but my primary team composition is as follows:
Azumarill @ Assault Vest
Ability: Huge Power
EVs: 164 HP / 252 Atk / 4 SpD / 84 Speed
Adamant Nature
-Superpower
-Play Rough
-Waterfall
-Aqua Jet
Talonflame @ Sharp Beak
Ability: Gale Wings
EVs: 252 HP / 252 Atk / 4 Speed
Adamant Nature
-Brave Bird
-Flare Blitz
-U-Turn
-Will-o-Wisp
Mawile @ Mawilite
Ability: Intimidate
EVs: 252 HP / 252 Atk / 4 Speed
Adamant Nature
-Play Rough
-Substitute
-Focus Punch
-Sucker Punch
Klefki @ Light Clay
Ability: Prankster
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
-Light Screen
-Reflect
-Foul Play
-Thunder Wave
Chandelure @ Choice Scarf
Ability: Flash Fire
EVs: 64 HP / 252 SpA / 192 Speed
Timid Nature
-Shadow Ball
-Fire Blast
-Energy Ball
-Hidden Power Fighting
Zygarde @ Lum Berry
Ability: Aura Break
EVs: 104 HP / 252 Atk / 152 Speed
Adamant Nature
-Outrage
-Earthquake
-Extreme Speed
-Dragon Dance
A bit on heavy on the Physical side I know, but it's worked for me in 6v6 so far.