ORAS Ubers What do you guys think of this team ? (I'm new here)

[LordWhis]

Lead: Darkrai
Bold 6 HP 180 def 72 sp attack & max speed
Assault Vest
Psychic
Foul Play
Drain Punch
Blizzard

Mew
Timid max speed 66 HP and 64 sp attack, sp def and def
Leftovers
Transform
Hypnosis
Psychic
Hail

Shaymin
Brave 92 HP, 90 def & 88 sp def. 80 in each of the rest
Miracle seed/ grass plate
Seed Flare
Seed Bomb
Rest
Grass Whistle

White Kyurem
Naughty 80 HP, attack, sp.def and sp. Attack, 92 speed and 98 def
Life Orb
Ancient Power
Hail
Freeze Burn
Fusion Flare

Mega Salamance
Gentle 90 in HP, 84 in everything else
Protect
Thunder fang
Fly
Draco Meteor
(Sometimes I think I should give him thunder, ice,fighting and ghost combo but I'm not too sure)

Dialga
Quirky 84 in HP and 84 in sp def 100 in speed 82 in sp attack and 80 in everything else.
Adamant Orb
Roar of time
Dragon Pulse
Iron Tail
Flash Cannon

What do u guys think ?

 

[TheMantyke]

Welcome to Smogon! I'd hate to be the bearer of bad news, but it's really obvious from this post you're not too familiar with the basic concepts of competitive Pokemon battling. I'd take the time to read through some of the on site introductions to competitive Pokemon as well as some of the analyses on site to work on your grasp of competitive mons. Good luck!

 

[Rcook]

Darkrai is known for Dark Void and not being bulky so do this set.
Darkrai @ Focus Sash
Ability: Bad Dreams
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Dark Void
- Dream Eater
- Nasty Plot
- Dark Pulse

Mew is bad don't use it, Klefki is better, use this set.
Klefki @ Leftovers
Ability: Prankster
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Thunder Wave
- Spikes
- Dazzling Gleam
- Metal Sound

Shaymin can hax so it can work, but use this set, it is a lot better.
Shaymin-Sky @ Choice Specs
Ability: Serene Grace
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Air Slash
- Seed Flare
- Earth Power
- Dazzling Gleam

White-Kyurem is better with Scarf so it can use it's speed stat, use this set instead.
Kyurem-White @ Choice Scarf
Ability: Turboblaze
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Ice Beam
- Earth Power
- Flash Cannon

Mega Mence is a d-dance that uses it's attack stat with a standard move set doing work.
Salamence-Mega @ Salamencite
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- Dragon Claw
- Return
- Earthquake

Dialga is another dragon type so don't use it, you should use Deoxys-Speed for Hazards and a support mon in general, here is the set.
Deoxys-Speed @ Focus Sash
Ability: Pressure
EVs: 248 HP / 8 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Skill Swap
- Stealth Rock
- Taunt
- Psycho Boost