Rate My OU Team, Any suggestions?

Question

Garchomp @ Rocky Helmet
Ability: Rough Skin
EVs: 252 HP / 4 Def / 252 Spe
Jolly Nature
- Dragon Claw
- Earthquake
- Fire Blast
- Toxic

Kartana @ Normalium Z
Ability: Beast Boost
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Leaf Blade
- Sacred Sword
- Giga Impact

Tyranitar @ Assault Vest
Ability: Sand Stream
EVs: 224 HP / 32 Atk / 252 SpD
Careful Nature
- Rock Slide
- Crunch
- Pursuit
- Earthquake

Mawile @ Mawilite
Ability: Intimidate
EVs: 92 HP / 252 Atk / 164 Spe
Adamant Nature
- Play Rough
- Thunder Punch
- Sucker Punch
- Brick Break

Gengar @ Life Orb
Ability: Cursed Body
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Shadow Ball
- Hypnosis
- Dream Eater
- Dark Pulse

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 52 Def / 100 SpD / 112 Spe
Jolly Nature
- Stealth Rock
- Earthquake
- Toxic
- Roost

Comments

Curious to ask, why Icy Wind on Gengar and why Thunderpunch/Brick Break instead of Iron Head?

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Thunder punch for a safe switch if someone puts in a water pokemon when I have my gliscor or garchomp out. Brick Break to counter any sort of ground or steel types and Icy Wind I have no idea why I put it in.

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