Updating My Team

Question

Finally i got my whole team with perfect IVs and EVs trained, so what about this team for Online Battles (Pokémon XY)? Suggestios are wellcomed!

Cofagrigus @Leftovers
Physical Tank and Burn.
Bold Nature (+Def, -Atk)
Ability: Mummy
EVs: 252 HP, 252 Def, 4 SDef
- Will-O-Wisp
- Hex
- Calm Mind
- Energy Ball (or Psychic?)

This is my physical tank, 427 Def is awsome, but isn't just it, with Will-O-Wisp he can burn and cut down Atk, so the opponent will need switch, in this moment just use Calm Mind gain some SDef and SAtk for Hex and Energy Ball/Psychic.

Milotic @Suggestion here?
Special Tank.
Calm Nature (+SDef, -Atk)
Ability: Marvel Scale
EVs: 252 HP, 128 SDef, 128 Def
- Scald
- Ice Beam
- Toxic (or another move?)
- Recover

Here is my beatiful special tank, with a great SDef and Recover, she can switch in and stall, Scald is STAB, also burn, Ice Beam is coverage and Toxic can be a great move if you can survive with Recover.

Mawile @Mawilite
Mega Sweeper.
Adamant Nature (+Atk, -SAtk)
Ability: Intimidate > Huge Power
EVs: 252 Atk, 252 HP, 4 Spe
- Sucker Punch
- Play rough
- Fire Fang (or Iron Head?)
- Sword Dance

Just my mega, awsome Atk, Fire Fang for Steel types or maybe Iron Head for STAB. 4 Spe sometimes can outspeed another Mawiles.

Garchomp @Choice Scarf
Physica Sweeper.
Adamant Nature (+Atk, -SAtk)
Ability: Rough Skin
EVs: 252 Atk, 252 Spe, 4 HP
- Dragon Claw
- Earthquake
- Fire Fang
- Poison Jab

The overpowered physical sweeper. Adamant nature cause speed is enough with scarf, Poison Jab is just a Fairy coverage and Dragon Claw is for reability.

Greninja @Life Orb
Special Sweeper.
Naive Nature (+Spe, -SDef)
Ability: Protean
EVs: 252 SAtk, 252 Spe, 4 Atk
- Scald
- Ice Beam
- Dark Pulse
- U-turn

Just a standard Ninja with Scald for burn.

Latios @Suggestion here?
EQ Switch.
Timid Nature (+Spe, -Atk)
Ability: Levitate
EVs: 252 SAtk, 252 Spe, 4 SDef
- Psyshock
- Ice Beam
- Thunder Bolt (or Surf?)
- Calm Mind

I really don't like using legendaries, but damn, I have a good one here and I'm very lazy to do a perfect Staraptor for now. I need a resistance against EQ, so here is Latios, also he is a great sweeper.

Comments

1. Latios @ Leftovers or Lum Berry (it's Calm Mind)
2. Cofagrigus: Energy Ball or Psychic might work for coverage. A minor detail would be getting walled by either Mandibuzz (due to Taunt) or Scrafty (due to Shed Skin removing burn). Plus it can't do anything to Bisharp anyway besides the burn, so you probably switch from any of those. Another alternative is Disable, so you can disable the enemy's super effective attack so you can wall them further.
3. Greninja: You can consider Surf or Hydro over Scald to guarantee more KO's. In most cases Greninja has no business staying in against anything that can resist anyway, I would not rely on a 30% burn chance. I want to hear your thoughts on Scald on Greninja, though. How is it in actual use?
4. Milotic: Leftovers. Or if Item Clause is in play, do Sitrus Berry. Toxic stalling is great.
5. Garchomp: Pretty standard, though the anti-Fairy move is a toss up between which of Poison Jab and Iron Head is better.
6. Mawile: Iron Head is better than Fire Fang in most cases.

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dont use 2 walls

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Actually 2 tank/walls can be a good idea in this environment. In singles x-y battle spot, you can use Cofagrigus if they're rocking a physical-heavy team (or Mega Kanga) or Milotic if the opponent has more special attackers. There's usually no reason to have them both in a team of 3, but having the option to pick the better one based on Team Preview is great.

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Thanks!
About Cofagrigus, I did with Energy Ball cause after Calm Mind he can be a 'sweeper' too, and if the opponent is using a Normal or Dark type I have some response.
Scald is a little bit weak, true, but when it burns helps me a lot, but maybe Hydro is a better option.
I was thinking about 2 walls too, I considered another sweeper, but I guess that my team can have a big weakness against special attacks and removing Milotic (cause Cafagrigus is the best tank here), I will lose Recover. I guess 2 walls isn't that bad.