rate this uber

Question

im not very good at competitive, so i need help
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
Shiny: Yes
EVs: 252 Atk / 252 Spe
Lonely Nature
- Earthquake
- Stealth Rock
- Toxic
- Brick Break

Palkia
Ability: Pressure
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk
- Dragon Pulse
- Water Pulse
- Hydro Pump
- Ice Beam

Lucario-Mega @ Lucarionite
Ability: Inner Focus
EVs: 252 Atk / 252 SpA / 4 Spe
- Close Combat
- Dragon Pulse
- Bullet Punch
- High Jump Kick

Aegislash @ Leftovers
Ability: Stance Change
Shiny: Yes
EVs: 252 Atk / 252 SpA
IVs: 0 Spe
- King's Shield
- Gyro Ball
- Shadow Ball
- Destiny Bond

Rayquaza
Ability: Air Lock
Shiny: Yes
EVs: 252 Atk / 252 SpA / 4 Spe
Naughty Nature
- Dragon Ascent
- Earthquake
- Extreme Speed
- Dragon Pulse

Groudon-Primal @ Red Orb
Ability: Desolate Land
Shiny: Yes
EVs: 4 HP / 252 Atk / 252 SpA
- Precipice Blades
- Eruption
- Iron Head
- Toxic

Comments

What are the missing items and natures?

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For me I will change Primal Groudon's Toxic with something else, Primal Groudon's attack is really strong  so it's better to change it with an attack move.