team building help

[koriboh8]

Hello I'm trying to get into the competative side of pokemon and I'm not 100% sure if this is a good team or not can someone help me out?

Xerneas @ Power Herb  
Ability: Fairy Aura  
Level: 50  
Shiny: Yes  
EVs: 252 HP / 248 SpA / 8 SpD  
Modest Nature  
- Geomancy  
- Moonblast  
- Protect  
- Hidden Power [Ground]  

Rayquaza-Mega @ Life Orb  
Ability: Delta Stream  
Level: 50  
Shiny: Yes  
EVs: 4 HP / 252 Atk / 252 Spe  
Hasty Nature  
- Extreme Speed  
- Dragon Ascent  
- Earthquake  
- Flamethrower  

Smeargle @ Focus Sash  
Ability: Moody  
Level: 50  
EVs: 244 HP / 12 SpD / 252 Spe  
Timid Nature  
- Dark Void  
- King's Shield  
- Swords Dance  
- Baton Pass  

Rotom-Wash @ Sitrus Berry  
Ability: Levitate  
Level: 50  
EVs: 252 HP / 252 SpA / 4 SpD  
Modest Nature  
- Thunderbolt  
- Hidden Power [Ice]  
- Hydro Pump  
- Thunder  

Landorus-Therian (M) @ Choice Band  
Ability: Intimidate  
Level: 50  
EVs: 244 HP / 252 Atk / 12 SpD  
Adamant Nature  
- Knock Off  
- Rock Slide  
- Protect  
- Earthquake  

Aegislash @ Weakness Policy  
Ability: Stance Change  
Level: 50  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Swords Dance  
- King's Shield  
- Shadow Sneak  
- Iron Head  

Thanks