Battle Frontier (Tower) Suggestions

Okay so Here it goes….

I’ve been working on the Battle Tower for a bit, and I have saved right before the Salon Maiden (Battle Tower Boss) and I am wondering if people have any suggestions about how to best battle her…? If they know what kind of battle plan she might have… or how I might be best able to deal with her based on my team…?

All of my Pokémon are Level 71.

Here is my team:

Gengar

Ability: Levitate

Item: Quick Claw

Nature: Naughty

Stats

HP 190

Attack 171

Defense 123

Spec Atk 191

Spec Def 109

Speed 191

Moves

Hypnosis

Nightmare

Shadow Punch

Sludge Bomb

Tyranitar

Ability: Sand Stream

Item: Shell Bell

Nature: Quirky

Stats

HP 237

Attack 242

Defense 176

Spec Atk 159

Spec Def 165

Speed 112

Moves

Crunch

Earthquake

Rock Slide

Mimic

Snorlax

Ability: Immunity

Item: Leftovers

Nature: Brave

Stats

HP 338

Attack 189

Defense 156

Spec Atk 110

Spec Def 164

Speed 61

Moves

Body Slam

Curse

Shadow Ball

Earthquake

Sorry for long post…

I welcome any and all positive suggestions on how to address this battle, Thank you!