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Need help...
I have a good team, but still not quite sure about some of the movesets. Need help with what items to use as well.

Gardevoir@???
Moonblast
Psychic
Hypnosis
Shadow Ball

Swellow@Toxic Orb
Facade
Brave Bird
Steel Wing
Quick Attack

Swampert@???
Waterfall
Ice Punch
Hammer Arm
Earthquake

Metagross@???
Earthquake
Bullet Punch
Iron Head
Zen Headbutt

Camerupt@???
Flamethrower
Stone Edge
Earth Power
Flash Cannon

Latios@???
Psychic
Draco Meteor
Thunder Bolt
Surf

Pls choose one mega