Edit: I took out Abomasnow in place of Mega Gardevoir. My team had no answer to Scrafty and Conkeldurr.
Gardevoir @ Gardevoirite
Telepathy/Pixilate
Modest
252 Sp. Atk/ 4 Sp. Def/ 252 Spd
-Dazzling Gleam
-Psychic
-Energy Ball
-Protect
Dazzling Gleam offers a 2HKO on Max HP Assault Vest Conkeldur and is a spread move. Psychic is my secondary STAB. Energy Ball is another way of dealing with Rotom-W. She can act alone for the most part. Also I have Telepathy which lets her switch in on Garchomps EQ before she megas without taking damage.
Garchomp @ Lum Berry
Rough Skin
Jolly
4 HP/ 252 Atk/ 252 Spd
-Dual Chop
-Earthquake
-Rock Slide
-Protect
This doesnt need much of an explanation. Everything is standard except for Dual Chop which I choose to use for the chance to break through a focus sash.
Rotom H @ Chesto Berry
Levitate
Modest
248 HP / 28 Sp. Atk / 232 Sp. Def
-Rest
-Discharge
-Will-o-Wisp
-Overheat
Rest is for recovery. Will-o=Wisp stops physical threats. Discharge is STAB and a spread move. Overheat is STAB. I chose this form because of Charizard-Y. Solar Beam can OHKO most Rotom-Ws. Rotom-H counters him well.
Sableye @ Sitrus Berry
Prankster
Calm
252 HP/ 252 Sp. Def/ 4 Spd
-Swagger
-Foul Play
-Recover
-Will-o-Wisp
This set doesn't need any explanation either really. The typical Swagger/Foul Play set. Recover is for recovery. Will-o-Wisp is for stopping physical sweepers before they can get going. He's an amazing Kangaskhan wall.
Avalugg @ Leftovers
Own Tempo
252 HP/ 4 Atk/ 252 Def/
-Avalanche
-Rock Slide
-Earthquake
-Recover
Avalanche takes advantage of his slow speed, turning into a 120 BP move. Rock Slide is for coverage. He matches up great against Talonflame. He can easily shake off an obvious Flare Blitz with Recover until Talonflame eventually kills itself or is forced to roost. Earthquake is for additional coverage.
Chansey @ Eviolite
Natural Cure
Bold
252 HP/ 252 Def/ 4 Sp. Def
-Seismic Toss
-Softboiled
-Heal Pulse
-Toxic
Seismic Toss is the only attacking move. Softboiled is for recovery.Heal Pulse is for healing my ally pokemon, and Toxic is for stalling ghost types who I can't hit except Aegislash. She can work with any other pokemon as a supporter.
Lead duo's
Sableye & Garchomp: Sableye can Swagger my Garchomp without worrying about confusion thanks to Lum Berry, thus allowing him to try and sweep through as much of the team as he can. Since Sableye doesnt have Protect I have to be careful when I choose to Earthquake
Sableye & Avalugg: SImilar to leading with Garchomp. Swagger wont confuse thanks to Own Tempo, effectively turning him into a physical attacking wall.
Avalugg & Chansey: My defensive Core lead. They take hits and shake them off with their recovery options and procede to do whatever damage they can.
Garchomp & Rotom: Disquake Combo! Also this is my lead for Dark Void Smeargles. Both of them can shake off sleep with their berries.