First ever doubles VGC 2015 team

[Rogue]

I think first of all, this should be sad: Sadly not every pokemon in VGC is viable, and it sucks because there are so many cool looking pokemon out there that are out classed on the field. I recommend one day trying out Smogon singles if you want to eventually play with all pokemon. It's cut in tiers so pokemon that aren't that good, go up against other pokemon that aren't that good: So it's always a even playing field and it helps them seem much more useful. That being said, let's work on your team:

How does a team of: Arcanine, Milotic, Virizion, Sylveon, Furfrou and Mega Gallade sound?
With these 6 we maintain great bulk and still have offensive pressure on all of our mons, excluding M-Gallade thats somewhat frail: But makes up for it in raw power and speed.

Milotic @ Assault Vest
Ability: Competitive
EVs: 252 HP / 216 Def / 36 SpA / 4 SpD
Modest Nature
- Scald
- Ice Beam
- Icy Wind
- Dragon Tail
This is my favorite Milotic set. With this you keep great bulk, while having decent SPA. However if you get the competitive boost, it does wonders. Competitive is like the opposite of Bisharps defiant. Instead of raising the attack 2 stages, it raises Milotics special attack by 2 stages. Scald is STAB + being a great move, ice beam is great coverage, icy wind for speed control, and dragon tail to switch out an opposing threat/maybe get the enemies intimidate user on the field.

Virizion @ Choice Scarf
Ability: Justified
EVs: 180 HP / 252 Atk / 68 Def / 8 Spe
Adamant Nature
- Close Combat
- Leaf Blade
- Zen Headbutt/Sacred Sword
- Stone Edge

For Virizion, I think this set would work best for you. Being able to outspeed so many things in the meta while having great offensive force. Close Combat/Leaf Blade are STAB and great moves. The 3rd is up to you, but I'd say put Sacred sword since we have m-gallade. Finally Stone edge is to hit things like Thundurus/Zapdos/etc

Arcanine @ Choice Band or Life Orb
Ability: Intimidate
Nature: Adamant
EVs: 110 HP + 152 ATK + 248 SPE
Wild Charge or Close Combat
Extreme Speed
Flare Blitz
Morning Sun or Crunch
I think an offensive Arcanine would work best on your team as well. We already have so much bulk, especially on Furfrou. So this would be a nice surprise to players who only see Arcanine as a stall user. The moves are generally up to you, as is the item.

Sylveon @ Choice Specs
Ability: Pixilate
Nature: Modest
EVs: 94 HP + 120 DEF + 248 Sp. ATK + 48 Sp. DEF
Hidden Power (Ground)
Hyper Voice
Shadow Ball
Hyper Beam

Sylveon is a monster and always does great work. Use it, it's like a staple on every team I make. Go in, click hyper voice, and watch things get KO'd. hidden power ground is for heatran who is a common threat. shadow ball for coverage, hyper beam to blow something up if needed.

I recommend using the furfrou build Naitre posted on the first page.

As for Mega Gallade:
Gallade-Mega (M) @ Galladite
Ability: Inner Focus
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Protect
- Close Combat
- Psycho Cut
- Ice Punch

This is the basic set for him currently and it works very well, this is also the set justin used to win his own tournament. Protect is to cover you as you m-evolve, while cc/psycho cut are stab. ice punch is for dragons/lando

This team definitely isn't bad and could be a real threat if you mess around with it and learn it all to the core.