Hi I was wondering if there is any flaws in my "dream team". I have all the Pokemon needed to finish this team... I just need to level them up and get the movesets/evolutions needed for this team. Anyway, please if you have any advice it would be highly appreciated. This is for Pokemon White btw:

Hydreigon
Dark/Dragon
-Crunch
-Stone Edge
-Draco Meteor
-Outrage

Venusaur
Grass/Poison
-Sludge Bomb
-Giga Drain
-Hidden Power
-Sleep Powder

Braviary
Normal/Flying
-Brave Bird
-Crush Claw
-Rock Slide
-Hone Claws

Chandelure (Evolve at lv.53)
Ghost/Fire
-Shadow Ball
-Fire Blast
-Energy Ball
-Hidden Power

Samurott
Water
-Surf
-Blizzard
-Air Slash
-Substitute

Metagross
Steel/Psychic
-Meteor Mash
-Earthquake
-Zen Headbutt
-Hyper Beam