ORAS Ubers RMT

[Hung]

Hi guys, i'm new with pokemon, i've just played it for 5 months and here is my Uber tier team. I need your sugestions to make it better. Also i'm sorry for my bad english. i'm using google translate.

Mewtwo-Mega-Y @ Mewtwonite Y
Ability: Insomnia
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Psystrike
- Focus Blast
- Shadow Ball
- Calm Mind

Xerneas @ Choice Scarf
Ability: Fairy Aura
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Geomancy
- Moonblast
- Aromatherapy
- Focus Blast

Rattata @ Focus Sash
Ability: Run Away
- Endeavor
- Blizzard
- Quick Attack
-

Giratina-Origin @ Griseous Orb
Ability: Levitate
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Shadow Force
- Rest
- Earthquake
- Aqua Tail

Lugia @ Leftovers
Ability: Multiscale
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
- Recover
- Giga Drain
- Aeroblast
- Calm Mind

Arceus @ Leftovers
Ability: Multitype
EVs: 252 HP / 252 Spe
Jolly Nature
- Swords Dance
- Avalanche
- Shadow Force
- Recover

 

[IronBullet]

Hi there, welcome to Smogon! Unfortunately I'll have to lock this for the time being as the RMT rules require that you provide in-depth descriptions for each Pokemon to explain your choices and their roles. Please read the rules carefully and take a look at other RMTs and the RMT archive to see the kind of detail and format we require. PM me with updated descriptions and I'll be happy to unlock this.

Since you're new to this I'd also recommend checking out the strategy dex for Pokemon analyses and the OU forum which has many resources that can help you get a better grasp of the tier. If you need any help don't hesitate to ask. Good luck!