[RATE MY TEAM] Enter the dragon type

[Nuclear Pikachu]

Hi I am a pikachu that managed to find a pit of toxic waste and swam in it.
This pikachu really likes battling but he has no idea how to make a good competitive team
This pikachu would really like some help making his team for the dragon competion.
Here is what i got.

Rayquaza (M) @ Left Overs
Ability: Delta Stream
EVs: 125 HP / 125 Atk / 64 Def / 47 SpA / 38 SpD / 87 Spe
Brave Nature
- Earthquake
- Dragon Claw
- Extreme Speed
- Overheat
I dont have much to say about this guy and is probaly going to be changed

Darkrai @ Big Root
Ability: Bad Dreams
EVs: 100 HP / 100 Atk / 100 Def / 100 SpA / 100 SpD / 10  Spe
Bashful Nature
- Dark Void
- Ominous Wind
- Dream Eater
- Nightmare

Groudon @ Red Orb
Ability: Drought
EVs: 252 HP / 252 Atk / 6  Spe
Adamant Nature
- calm Mind
- Fire Punch
- Rock Polish
- Precipice Blades

Sylveon @ Pixie Plate
Ability: Pixilate
EVs: 50 HP / 60 Atk / 50 Def / 50 SpA / 50 SpD / 50  Spe
Bashful Nature
- Hyper Voice
- Iron Tail
- Magic Coat
- Last Resort

I cant think of something to say about this :3

Hydreigon @ Lum Berry
Ability: Levitate
EVs: 125 HP / 125 Atk / 64 Def / 47 SpA / 38 SpD / 87  Spe
Bashful Nature
- Earthquake
- Dragon Claw
- Extreme Speed
- Last Resort

I cant think of something to say about this :3

Well thats what i could come up with. Give me any helpful input that you can and will :D
,Thanks
For those that dont know the rules for the comp here is a link

http://3ds.pokemon-gl.com/information/65...08e0cbd1a4