I am hoping that my team at the E4 will be:
(I will not be using legends or changing natures, some pokemon I do not have, so it will be difficult for posting the natures.)

Samurott
Nature: Rash
Ability: Torrent
Hold Item: Mystic Water
Moves:
Surf
Waterfall
Ice Beam
Revenge

Lucario
Nature: Bashful
Ability: Steadfast
Hold Item: ????
Moves:
Ice Punch
Dig
Brick Break
Aura Sphere

Krookodile
Nature: Hardy
Ability: Moxie
Hold Item: Soft Sand(?)
Moves:
Strength
Crunch
Earthquake
Not sure

Sigilyph
Nature: Bold
Ability: Magic Guard
Hold Item: Twisted Spoon
Moves:
Fly
Psychic
Ice Beam
Not sure

Chandelure
Nature: ???
Ability: ???
Hold Item: Charcoal
Moves:
Flamethrower
Shadow Ball
Energy Ball
Dark Pulse (?)

Eelektross
Nature: ???
Ability: ???
Hold Item: Magnet
Moves:
Discharge
Thunderbolt
Crunch
Dragon Claw
Note: I am having a hard time finding a Tynamo so if you could suggest another electric type with its moveset and held item then I would be very grateful.