[ORAS] VGC 2015 team help

[Gengarrett]

Hey everyone! I am a little new to the Pokemon Metagame and I was hoping to get some advice on a team that I made for doubles.

Amoongus @ Sitrus Berry

Ability : Regenerator

Nature : Sassy

EVs: 252 HP, 180 Sp. D, 76 Def

IVs : 31/?/31/31/31/0

Moves :

Spore

Protect

Rage Powder

Giga Drain



Slowbro-Mega @ Slowbronite

Ability: Regenerator (thinking about Oblivious)

Nature: Relaxed

EVs : 252 Def, 4 Sp. A, 252 HP

IVs: 31/?/31/31/31/0

Moves:

Slack Off

Calm Mind

Scald

Psyshock



Hydreigon @ Choice Scarf

Ability: Levitate

Nature : Modest

EVs: 252 Sp. A, 252 Speed, 4 HP

IVs: 31/?/31/31/31/31

Moves:

Draco Meteor

Flash Cannon

Earth Power

Dark Pulse



Sylveon @ Choice Specs

Ability : Pixilate

Nature: Quiet

EVs : 252 Def, 252 Sp. A, 4 Sp. D

IVs: 31/29/31/30/30/1

Moves:

Hyper Voice

Psyshock

Shadow Ball

HP Ground



Terrakion @ Focus Sash

Ability: Justified

Nature: Jolly

EVs: 252 A, 252 Speed, 4 Sp. D

IVs: 31/31/31/?/31/31

Moves:

Earthquake

Close Combat

Rock Slide

Protect



Talonflame @ Safety Goggles

Ability: Gale Wings

Nature: Naughty

EVs: 252 A, 252 Speed, 4 Sp. D

IVs:All perfect

Moves:

Brave Bird

Will-o-wisp

Protect

Overheat



Basic strategy of my team is to defeat all of Mega Slowbro's Checks and Counters, get 2 to 3 calm minds off with Mega Slowbro Slack off and sweep.