SM OU Need to know what to change! Suggestions?

[PhoKiing]

Mawile-Mega @ Mawilite
Ability: Huge Power
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Play Rough
- Swords Dance
- Iron Defense
- Sucker Punch

Breloom @ Focus Sash
Ability: Technician
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Spore
- Bullet Seed
- Mach Punch
- Rock Tomb

Snorlax @ Leftovers
Ability: Thick Fat
EVs: 252 HP / 4 Atk / 252 SpD
Careful Nature
- Sleep Talk
- Rest
- Curse
- Body Slam

Aegislash @ Weakness Policy
Ability: Stance Change
EVs: 252 HP / 252 Atk / 4 Def
Brave Nature
- Shadow Ball
- Sacred Sword
- King's Shield
- Swords Dance

Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Wish
- Psyshock
- Protect
- Hyper Voice

Dragonite @ Weakness Policy
Ability: Multiscale
EVs: 4 HP / 252 Atk / 252 Spe
Serious Nature
- Earthquake
- Dragon Dance
- Extreme Speed
- Dragon Claw

 

[Earl of Whales]

Well for starters, Aegislash is banned on OU

 

[Snowy]

Welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide in-depth descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.