Finally got to the E4

So I finally got to the E4 and I was wondering if I could take them without much difficulty with my team.

D-Blastoise:
Aura Sphere
Calm Mind
Dark Pulse
Flash Cannon

D-Snorlax:
Belly Drum
Drain Punch
Earthquake
Seed Bomb

D-Gardevoir:
Calm Mind
Earth Power
Ice Beam
Thunderbolt

D-Hydreigon:
Body Slam
Coil
Earthquake
Superpower

Sigilyph:
Air Slash
Calm Mind
Dazzling Gleam
Psychic

D-Lilligant (Fire):
Calm Mind
Earth Power
Flamethrower
Scald

Are these optimal movesets, or is there room for improvement? Thanks in advance