Psychout!

[ThatSlickNick]

All Perfect IV

Gardevoir (M) @ Gardevoirite
Ability: Synchronize
Level: 50
Shiny: Yes
EVs: 252 HP / 252 SpA / 4 Spe
Modest Nature
- Calm Mind
- Moonblast
- Psychic
- Shadow Ball

Gallade @ Expert Belt
Ability: Steadfast
Level: 50
Shiny: Yes
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Close Combat
- Swords Dance
- Psycho Cut
- Leaf Blade

Metagross @ Rocky Helmet
Ability: Clear Body
Level: 50
Shiny: Yes
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Meteor Mash
- Hammer Arm
- Earthquake
- Toxic

Wobbuffet (M) @ Leftovers
Ability: Shadow Tag
Level: 50
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Counter
- Mirror Coat
- Encore
- Destiny Bond

Sigilyph (F) @ Red Card
Ability: Magic Guard
Level: 50
EVs: 100 HP / 156 SpD / 252 Spe
Calm Nature
- Whirlwind
- Thunder Wave
- Flash
- Hypnosis

Alakazam @ Alakazite
Ability: Magic Guard
Level: 50
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Calm Mind
- Psychic
- Energy Ball
- Hidden Power

 

[Nah]

A Focus Sash and Jolly nature might be better on Gallade to ensure that it survives long enough to get up a Swords Dance and is fast enough to deal damage on the next turn.

I feel that you're kinda wasting Metagross's best attributes with your current set. It has great HP, Attack, and Defense, but sub-par Speed and and Sp.Defense. No one's really going to attack Metagross with physical contact moves because of that, especially when Dark Pulse and Shadow Ball are very common and specially based. Rocky Helmet is better on pokes like Garchomp or Ferrothorn who have an ability that also hurts physical contact attackers, or stuff like Skarmory that's really bulky and has good recovery so it can switch in multiple times without worry. I think this'd be better:

-Metagross w/Assault Vest
Nature: Adamant
Ability: Clear Body
EVs: 252 HP, 252 Attack, 4 Sp.Defense
Moves: Meteor Mash, Earthquake, Zen Headbutt, Bullet Punch

This set patches up Metagross's weaker Sp.Defense while maximizing it's offensive potential. Bullet Punch also makes up for its lowish Speed. You can roll with Hammer Arm over Earthquake or Zen Headbutt if you want.

Sigilyph, as you have to now, is total Taunt bait, which is never a good thing. Your team is also kinda physically frail, so you might wanna try this set ti help you out with that:

Sigilyph @ Flame Orb
Ability: Magic Guard
EVs: 252 HP / 16 Def / 240 Spe
Timid Nature
- Psycho Shift
- Roost
- Calm Mind
- Air Slash

Sigilyph is immune to the burn damage from the Flame Orb (and being burned prevents it from being effected by other status conditions), and Psycho Shift lets you burn opposing Pokemon, cutting their Attack.

MegaZam is too frail to set up Calm Minds, so another coverage move may be better, like Focus Blast. And what's it's Hidden Power type?

Also, Mega Gardevoir wants Psyshock over Psychic, for special walls.

 

[The Canceler]

Although it seems like a good idea to put Mega Stones on two Pokemon for "versatility," it's really never a good idea. Magic Guard lets Alakazam abuse Life Orb without taking the recoil damage. Also, Alakazam doesn't do much with Energy Ball. Focus Blast is the better option.

Wobbuffet isn't really a big threat anymore, and there are plenty of much better options, such as Reuniclus, who can also run a very powerful Life Orb set; Slowbro, who can be used as a physical wall; or Starmie, who can be used as a fantastic sweeper.

 

[PlatinumDude]

To build on to Zekrom's rate:

Night Slash > Leaf Blade on Gallade, simply because a 2x super effective Leaf Blade does the same amount of damage as a STAB neutral Close Combat:
-2x supereffective Leaf Blade: 90 x 2 = 180
-STAB neutral Close Combat: 120 x 1.5 = 180

Unless you're deathly afraid of Quagsire, Gastrodon or Swampert (the last one for some weird reason, considering it's not commonly used anymore), Night Slash provides better coverage with Fighting/Psychic.

As mentioned before, Mega Alakazam is too frail to set up Calm Mind. Better options in the last slot are Hidden Power Ice/Fire, assuming Alakazam has either Hidden Power type, (in order to deal with Dragonite, Landorus and Gliscor, and Ferrothorn and Scizor, respectively), Substitute (to have a buffer against status or other moves on a predicted switch) or Protect (to Mega Evolve safely, given Alakazam's general frailty). Tl;dr:
-Psychic
-Shadow Ball
-Focus Blast
-Hidden Power (Ice/Fire)/Protect/Substitute
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Alakazite
Ability: Magic Guard

If you can use Poke Transfer, Mega Gardevoir needs Hyper Voice over Moonblast. Pixilate doesn't affect moves that are already Fairy type, and it only benefits Normal moves, so if Mega Gardevoir doesn't have Hyper Voice, there's absolutely no reason to use the Mega Evolution at all. And Mega Gardevoir's 100 Speed is rather good; why are you wasting that away by investing in bulk? It's still physically frail with investment. Shadow Ball doesn't see much use at all, unless it's for Aegislash. However, given Aegislash's popularity in Battle Spot, you could use it. Trace is also the preferred ability pre-Mega Evolution so that Gardevoir has utility in copying defensive abilities upon switching in, like Intimidate or Flash Fire. Much better set down here:
-Psyshock
-Hyper Voice
-Focus Blast/Shadow Ball
-Taunt/Will-o-Wisp/Calm Mind
Nature: Timid/Modest
EVs: 24 Def/232 SAtk/252 Spe
Item: Gardevoirite
Ability: Trace

Also, here's a better set for Wobbuffet; it's too slow for Destiny Bond; Safeguard is the better option to protect the team from status:
-Counter
-Mirror Coat
-Encore
-Safeguard
Nature: Calm/Bold
EVs: 28 HP/252 Def/228 SDef
Item: Sitrus Berry/Leftovers
Ability: Shadow Tag

Although it seems like a good idea to put Mega Stones on two Pokemon for "versatility," it's really never a good idea. Magic Guard lets Alakazam abuse Life Orb without taking the recoil damage. Also, Alakazam doesn't do much with Energy Ball. Focus Blast is the better option.

Wobbuffet isn't really a big threat anymore, and there are plenty of much better options, such as Reuniclus, who can also run a very powerful Life Orb set; Slowbro, who can be used as a physical wall; or Starmie, who can be used as a fantastic sweeper.

You're underestimating Mega Alakzam's effectiveness. It has utility in using opposing abilities with Trace, i.e. copying Kingdra's Swift Swim, then KOing it in return, copying Dragonite's Multiscale to compensate for frailty. While the loss in Magic Guard sucks for Mega Alakazam, Modest Mega Alakazam hits harder than Timid regular Alakazam. 150 Speed outspeeds base 130 Speed Pokemon, even with a neutral nature. In all cases, Alakazam's best time to be brought in is after a teammate is KOed.

Wobbuffet still has some utility in eliminating/making counters setup bait with Shadow Tag. However, here are Slowbro and Starmie sets should the need arise:

Slowbro:
-Scald
-Psyshock/Ice Beam/Fire Blast
-Thunder Wave/Toxic
-Slack Off
Nature: Bold
EVs: 252 HP/232 Def/24 SDef
Item: Leftovers/Rocky Helmet
Ability: Regnerator

Starmie:
-Hydro Pump
-Ice Beam
-Psyshock/Thunderbolt
-Rapid Spin
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Leftovers
Ability: Natural Cure

 

[The Canceler]

You're underestimating Mega Alakzam's effectiveness. It has utility in using opposing abilities with Trace, i.e. copying Kingdra's Swift Swim, then KOing it in return, copying Dragonite's Multiscale to compensate for frailty. While the loss in Magic Guard sucks for Mega Alakazam, Modest Mega Alakazam hits harder than Timid regular Alakazam. 150 Speed outspeeds base 130 Speed Pokemon, even with a neutral nature. In all cases, Alakazam's best time to be brought in is after a teammate is KOed.

No doubt Mega Alakazam is useful in various situations, but I just see Mega Gardevoir as more useful overall. Also, Alakazam can be used without a Mega Evolution, while Gardevoir really can't.

 

[ThatSlickNick]

ok so ADVISED psychic team

Gardevoir (F) @ Gardevoirite
Ability: Synchronize
Level: 50
Shiny: Yes
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Calm Mind
- Moonblast
- Psychic
- Thunderbolt

Gallade @ Muscle Band
Ability: Steadfast
Level: 50
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Close Combat
- Earthquake
- Psycho Cut
- Swords Dance

Alakazam (M) @ Alakazite
Ability: Magic Guard
Level: 50
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Calm Mind
- Energy Ball
- Psychic
- Shadow Ball

Wobbuffet (F) @ Leftovers
Ability: Shadow Tag
Level: 50
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Counter
- Mirror Coat
- Encore
- Destiny Bond

Sigilyph @ Red Card
Ability: Wonder Skin
Level: 50
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 30 Atk / 30 Def / 30 SpD
- Whirlwind
- Hypnosis
- Toxic
- Roost

Slowbro (F) @ Rocky Helmet
Ability: Oblivious
Level: 50
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Spe
- Flamethrower
- Ice Beam
- Trick Room
- Thunder Wave

 

[PlatinumDude]

ok so ADVISED psychic team

Gardevoir (F) @ Gardevoirite
Ability: Synchronize
Level: 50
Shiny: Yes
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
- Calm Mind
- Moonblast
- Psychic
- Thunderbolt

Gallade @ Muscle Band
Ability: Steadfast
Level: 50
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Close Combat
- Earthquake
- Psycho Cut
- Swords Dance

Alakazam (M) @ Alakazite
Ability: Magic Guard
Level: 50
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Calm Mind
- Energy Ball
- Psychic
- Shadow Ball

Wobbuffet (F) @ Leftovers
Ability: Shadow Tag
Level: 50
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Counter
- Mirror Coat
- Encore
- Destiny Bond

Sigilyph @ Red Card
Ability: Wonder Skin
Level: 50
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 30 Atk / 30 Def / 30 SpD
- Whirlwind
- Hypnosis
- Toxic
- Roost

Slowbro (F) @ Rocky Helmet
Ability: Oblivious
Level: 50
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Spe
- Flamethrower
- Ice Beam
- Trick Room
- Thunder Wave

As I mentioned before, Mega Gardevoir needs Hyper Voice; otherwise, the Mega Evolution is pointless; also, Speed investment is preferred over bulk investment. Thunderbolt doesn't really do much for Mega Gardevoir, as Mandibuzz is hit by the Fairy STAB anyways. Focus Blast is preferred in the last slot for coverage against Steels.

Earthquake is redundant with Close Combat on Gallade. Drop it for Night Slash (or Knock Off if you have Poke Bank).

As Zekrom mentioned, Mega Alakazam is too frail to use Calm Mind; the last slot should be spent on Protect to Mega Evolve safely or Hidden Power Fire/Ice for coverage for Ferrothorn, Scizor, Gliscor and Therian Landorus, respectively. Drop Energy Ball for Focus Blast; the coverage for Steels is way too important to give up.

See the EV spread I posted for Wobbuffet for the optimal one. As it stands, Wobbuffet is still prone to physical attacks.

Sigilyph is utter Taunt bait. -_- Magic Guard is the superior ability for Sigilyph in all cases. Here's the better defensive Sigilyph set for you to use:
-Cosmic Power
-Stored Power/Air Slash
-Psycho Shift
-Roost
Nature: Timid
EVs: 252 HP/4 SAtk/252 Spe
Item: Flame Orb
Abiilty: Magic Guard

The lack of STAB and reliable recovery on Slowbro hurts. Thunder Wave doesn't mesh well with Trick Room, since Thunder Wave benefits the opponent in Trick Room by making them slower. Here's the superior Slowbro set for you to use. Regenerator is also better than Oblivious on Slowbro because of the 33% HP recovery upon switching out:
-Scald
-Psyshock/Ice Beam/Fire Blast
-Thunder Wave/Toxic
-Slack Off
Nature: Bold
EVs: 252 HP/232 Def/24 SDef
Item: Leftovers/Rocky Helmet
Ability: Regnerator