Strategics pokemon

So i want to show these 2 teams (one old (before and after modifications) and one recent not done yet on ORAS)
Calculated (and guessed) of iv and ev done thanks to pokemon online

The 1st, old one (arrows show the changes that i would like) :
Gallade :
Ev : 188/164/8/6/8/136 ---> 4/0/0/0/252/252
Iv : 31/31/31/16/31/31
Held Item : Galladite
Nature : Quiet (+spe atk/-spe) ---> Careful (-spe atk/+spe def)
Ability : Steadfast ---> Justified
Moves : Close Combat/Zen Headbutt/Night Slash/Protect ---> Drain Punch/Zen Headbutt/Ive Punch/Confuse Ray

Gardevoir :
Ev : 220/0/0/160/6/124 ---> 4/0/252/0/0/252
Iv : 31/31/31/31/1/31 ---> 31/xx/31/31/31/31
Held Item : Choice Scarf ---> Choice Specs
Nature : Lonely (+atk/-def) ---> Assuré (+def/-atk)
Ability : Synchronize
Moves : Moonblast/Psychic/Shadow Ball/Trick ---> Moonblast/Psychic/Energy Ball/Thunder

Lucario :
Ev : 160/148/0/0/42/160 ---> 156/160/96/0/96/0
Iv : 31/31/31/31/20/31
Held Item : Life Orb ---> Black Belt
Nature : Adamant (+atk/-spe atk)
Ability : Inner Focus ---> Steadfast
Moves : Swords Danse/Extremespeed/Close Combat/Ice Punch ---> Swords Danse/Sky Uppercut/Extremespeed/Close Combat

Metagross :
Ev : 244/182/84/0/0/0 ---> 192/176/20/0/120/0
Iv : 31/15/31/31/31/31 ---> 31/31/31/xx/31/31
Held Item : Assault Vest ---> Full Insence
Nature : Lax (+def/-spe def) ---> Gentle (+spe def/-def)
Ability : Clear Body
Moves : Bullet Punch/Zen Headbutt/Meteor Mash/Earthquake ---> Thunder Punch/Gyro Ball/Zen Headbutt/Earthquake

Zoroark :
Ev : 180/10/0/132/0/188 ---> 156/228/60/0/64/0
Iv : 31/24/31/31/31/31 ---> 31/31/31/31/31/xx
Held Item : Band ---> Life Orb
Nature : Rash (+spe atk/-spe def)
Ability : Illusion
Moves : Punishment/Night Daze/Focus Blast/Flamethrower ---> Flamethrower/Nasty Plot/Swords Danse/Bounce
Note : I believe that my best perfect pokemon in iv

Salamence :
Ev : 252/0/184/6/0/68 ---> 4/0/252/0/252/0
Iv : 31/31/31/23/31/31 ---> 31/31/xx/31/31/31
Held Item : Leftovers
Nature : Brave (+atk/-spe) ---> Adamant (+atk/-spe atk)
Ability : Intimidate
Moves : Toxic/Flamethrower/Dragon Tail/Roost ---> Toxik/Atterrissage/Séisme/Colère
Note : I hesitate to keep Dragon Tail to can trolled my opponent with the combo "Toxic, Dragon Tail" to the infinite and poisoned an whole team (except Steel, Fairy and Poison type)

I will cannot explain the functioning of this team at the moment, because she's in constant change and your opinon will allow me finaly to finish it. On the other hand, in ev level i've done anything with the Super Training.

The 2nd, the new one :

Chandelure :
Ev : 252/0/0/252/0/4
Iv : 31/31/31/31/31/xx
Held Item : Wide Lens
Nature : Modest (+spe atk/-atk)
Ability : Infiltrator
Moves : Double Team/Dark Pulse/Flash/Fire Blast

Dragalge :
Ev : 252/0/0/200/0/56
Iv : 31/xx/31/31/31/31
Held Item : Black Sludge
Nature : Timid (+spe/-atk)
Ability : Adaptability
Moves : Venom Drench/Toxic Spikes/Sludge Wave/Dragon Tail

Barbaracle :
Ev : 0/252/136/0/100/20
Iv : 31/31/31/xx/31/31
Held Item : Scope Lens
Nature : Jolly (+spe/-spe atk)
Ability : Sniper
Moves : Cross Chop/Night Slash/Slash/Bulk Up (i hésitate with Sword Danse)

Rhyperior :
Ev : 4/252/0/0/252/0
Iv : 31/31/31/xx/31/31
Held Item : Assault Vest
Nature : Careful (+spe def/-spe atk)
Ability : Solid Rock
Moves : Hammer Arm/Payback/Aqua Tail/Rock Wrecker

Alakzam :
Ev : 252/0/252/4/0/0
Iv : 31/xx/31/31/31/31
Held Item : Light Clay
Nature : Calm (+spe def/-atk)
Ability : Magic Guard
Moves : Raflect/Psychic/Light Screen/Signal Beam

Aggron :
Ev : 168/160/0/182/0/0
Iv : 31/31/31/31/xx/31
Held Item : Aggronite
Nature : Lonely (+atk/-def)
Ability : Sturdy
Moves : Ancientpower/Earthquake/Iron Head/Payback

Explanation :
The "center" of the team, play essentially on Alakazam which is here to protect in maximun Rhyperior, which is there to do tons of damage, which are reduce by 50% after the passage of Alakazam and moves are more reduce by 50% thanks to assault vest and more by 50% of reduction of damage thanks to Solid Rock thus allowing to Rhyperior to resist easily in an hydro pump buff in +6 (because water moves are focused on special), but not moves like grass knot (because even with reflect, i guess in OHKO).

Barbaracle is the "critical player" because he's do for that, thanks to sniper, to launch moves in high critical hit rate like cross chop or slash (if possible in buff with bulk up/swords danse) to try to perforated trough the walls like Aggron.

Justly, Aggron is there and that's he which wear mega stone because his ability (filter) have the same effect that Rhyperior therefore more practice and ancientpower is present for stats's increases, iron head for the stab and payback, saw his slwoness, will do many damage, as Rhperior which, he, can slow down himself with hammer arm if an opponent is slower than him at the base.

Chandelure is almost untouchable if he succeeds to place combo double team/flash and thanks to his excellent special attack, he complete, someway, Rhyperior.

The work of Dragalge is placing toxic spikes and poisoned each opponent's pokemon possible (except steel and poison type, dragon tail cannot pass on the fairy type), it's in someway, the setter of trap. And on top of that, he's not bad in defense and special défense, therefore i've less risks of k.o.

And finally, Alakazam. Thanks to light clay, light screen and reflect are extended of 3 rounds, leaving free neighborhood to Rhyperior (and eventually Chandelure) to inflict the maximum of damages. And his ability : magic guard protect him of capacity such as taunt or torment, which leave him ample time to place the defenses.

Well, i wait your opignons :)

As an FYI, Gentle and Lax are bad natures in competitive play, since they do nothing to a Pokemon's offenses or Speed.

Gallade and Gardevoir are only worth using as their Mega Evolutions. Since neither of their regular forms are worth using in standard play, and you can only Mega Evolve 1 Pokemon per battle, you must pick one out of the two. Gallade has to be Jolly with max Attack/max Speed to make the most out of its offensively-leaning stats:
-Swords Dance
-Zen Headbutt
-Close Combat/Drain Punch
-Knock Off/Ice Punch/Shadow Sneak
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Galladite

Gardevoir:
-Psyshock
-Hyper Voice
-Focus Blast
-Taunt/Will-o-Wisp/Calm Mind
Nature: Timid/Modest
EVs: 24 Def/232 SAtk/252 Spe
Item: Gardevoirite
Ability: Trace

Weavile or Bisharp can fill in the empty slot, since either one can provide Pursuit support to get rid of bulky Psychic Pokemon:

Weavile:
-Knock Off
-Icicle Crash
-Ice Shard
-Pursuit
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb
Ability: Pressure

Bisharp:
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe (Life Orb/Lum Berry/Dread Plate/Black Glasses) or 192 HP/220 Atk/96 Spe (Assault Vest)
Item: Life Orb/Lum Berry/Dread Plate/Black Glasses/Assault Vest
Ability: Defiant

The way the 1st team is set up now, it's somewhat vulnerable to Talonflame, as it has priority Brave Birds thanks to Gale Wings. Checks/counters to it are ideal, like Wash Rotom, Tyranitar, and defensive Garchomp, which have the bulk to take its attacks. Replace Salamence with Garchomp, as the former's regular form has little reason to be used over things like Charizard X or Dragonite. Replace Lucario with Wash Rotom or Tyranitar to help with Talonflame:

Wash Rotom:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Rest
Nature: Bold
EVs: 248 HP/252 Def/8 Spe
Item: Leftovers/Chesto Berry

Garchomp:
-Stealth Rock
-Dragon Tail
-Earthquake/Toxic
-Fire Blast/Toxic
Nature: Impish
EVs: 240 HP/176 Def/92 Spe
Item: Rocky Helmet
Ability: Rough Skin

Tyranitar:
-Stone Edge
-Crunch/Ice Punch
-Pursuit
-Superpower
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe (Jolly) or 100 HP/252 Atk/156 Spe (Adamant)
Item: Choice Scarf (Jolly)/Choice Band (Adamant)
Ability: Sand Stream

Regular Metagross is a bit of a niche Pokemon, since its Mega Evolution overshadows it in terms of raw power. Since you already have a Mega Evolution in Gardevoir or Gallade, Choice Specs Sylveon or Unaware Clefable are good partners for Gallade, while Magnezone is a good partner for Gardevoir to remove Steel Pokemon so the latter is less reliant on Focus Blast:

Sylveon:
-Hyper Voice
-Psyshock
-Shadow Ball/Hidden Power (Fire/Ground)
-Baton Pass
Nature: Modest
EVs: 240 HP/252 SAtk/16 Spe
Item: Choice Specs
Ability: Pixilate

Clefable:
-Wish
-Protect
-Moonblast
-Heal Bell/Aromatherapy
Nature: Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Unaware

Magnezone:
-Thunderbolt
-Volt Switch
-Flash Cannon
-Hidden Power (Fire)
Nature: Modest/Timid
EVs: 172 HP/252 SAtk/84 Spe (Modest) or 4 HP/252 SAtk/252 Spe (Timid)
Item: Choice Specs (Modest)/Choice Scarf (Timid)
Ability: Magnet Pull

or
-Magnet Rise
-Thunderbolt
-Flash Cannon
-Hidden Power (Fire)
Nature: Modest
EVs: 128 HP/252 SAtk/128 Spe
Item: Air Balloon
Ability: Magnet Pull

As fun as Zoroark is to use, sometimes it's not worth using because it struggles with Fairies without the aid of Sludge Bomb, an event move. It does a good job of scaring them out, however, with the right disguise. You can include Starmie (or Excadrill if you're using Tyranitar) as a Rapid Spinner instead to deal with Weavile's Stealth Rock weakness:

Starmie:
-Hydro Pump
-Psyshock/Thunderbolt
-Ice Beam/Hidden Power (Fire)
-Rapid Spin
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb
Ability: Natural Cure/Analytic

or
-Scald
-Psyshock/Reflect Type
-Rapid Spin
-Recover
Nature: Timid
EVs: 252 HP/4 SAtk/252 Spe
Item: Leftovers
Ability: Natural Cure

Team 2:

Dragalge is way too slow to abuse a Timid nature. Yes, Venom Drench can seriously weaken a poisoned opponent, but they're more likely to switch out, rendering the move useless. Dragalge also has a decent offensive move pool, meaning it's better off spending 3/4ths of its moveslots on offensive moves:
-Sludge Wave
-Draco Meteor
-Focus Blast/Hidden Power (Fire)
-Scald/Toxic Spikes
Nature: Modest
EVs: 228 HP/252 SAtk/28 Spe
Item: Choice Specs/Black Sludge
Ability: Adaptability

or
-Toxic Spikes
-Sludge Wave
-Dragon Pulse/Draco Meteor
-Scald
Nature: Calm
EVs: 248 HP/232 SDef/28 Spe
Item: Black Sludge
Ability: Adaptability

Mega Aggron could be used in standard play, but there's an opportunity cost in using it, since it takes up the Mega slot and faces competition from both Skarmory and Ferrothorn as a defensive Steel Pokemon. If you don't mind not using Skarmory and Ferrothorn, here's a better set for Mega Aggron, as Lonely wastes away its incredible Defense, while Ancient Power is a pathetic move coming off of Aggron's low Special Attack and the stat boosts only have a 10% chance of happening, which is very unlikely considering the move's 8 max PP:
-Stealth Rock
-Heavy Slam/Iron Head
-Rock Slide/Earthquake/Fire Punch
-Avalanche/Ice Punch/Thunder Wave
Nature: Relaxed
EVs: 252 HP/16 Def/240 SDef
Item: Aggronite
Ability: Sturdy

If you're ever interested in using Skarmory or Ferrothorn, these are better sets:

Ferrothorn:
-Stealth Rock/Spikes
-Leech Seed
-Power Whip/Protect
-Gyro Ball/Thunder Wave
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers/Shed Shell
Ability: Iron Barbs

Skarmory:
-Stealth Rock/Spikes/Defog
-Brave Bird/Counter
-Whirlwind/Taunt
-Roost
Nature: Impish/Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers/Rocky Helmet
Ability: Sturdy

or
-Iron Head
-Spikes
-Whirlwind/Taunt
-Roost
Nature: Careful
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Sturdy

Both Rhyperior and Barbaracle share nasty weaknesses to Grass, Fighting and Ground, the latter two of which are very common attacking types. I'd recommend scrapping them entirely.

Azelf makes for a nice dual screen lead, as it's oh-so-slightly bulkier than Alakazam when it comes to setting them up:
-Reflect
-Light Screen
-Taunt/Stealth Rock
-Explosion/Stealth Rock
Nature: Jolly
EVs: 176 HP/80 Def/252 Spe
Item: Light Clay

Other setup sweepers you can use with dual screens are Mega Altaria, Mega Heracross, (if you chose to replace Aggron), Breloom, Diggersby, and Feraligatr:

Altaria:
-Dragon Dance
-Return
-Earthquake
-Roost/Fire Blast
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Altarianite

or
-Dragon Dance
-Return
-Earthquake/Substitute/Heal Bell
-Roost
Nature: Impish
EVs: 248 HP/136 Def/96 SDef/28 Spe
Item: Altarianite

Heracross:
-Pin Missile/Substitute
-Close Combat
-Rock Blast
-Swords Dance/Substitute
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Heracronite
Ability: Guts/Moxie

Breloom:
-Swords Dance
-Seed Bomb
-Superpower/Drain Punch
-Facade
Nature: Jolly
EVs: 12 HP/244 Atk/252 Spe
Item: Toxic Orb
Ability: Poison Heal

Diggersby:
-Swords Dance
-Return
-Earthquake
-Quick Attack
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Focus Sash
Ability: Huge Power

Feraligatr:
-Dragon Dance
-Waterfall
-Crunch/Ice Punch
-Superpower/Ice Punch
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb
Ability: Sheer Force

If you really want a Shell Smash user on the team, Cloyster is better, since it has better physical bulk to take a hit before Shell Smashing:
-Shell Smash
-Razor Shell/Hydro Pump
-Icicle Spear
-Rock Blast
Nature: Jolly/Naive
EVs: 252 Atk/4 Def/252 Spe
Item: White Herb/Lum Berry/Focus Sash
Ability: Skill Link

Chandelure, I'm not so sure about, since it suffers from both a Stealth Rock weakness and a Pursuit weakness. Including Bisharp or the Rapid Spinners I pointed out above over that will either discourage the opponent from using Defog from getting rid of the Screens or provide hazard removal support, respectively.

If you want to keep Chandelure Modest you should just make it an all out sp. attacker. Give it a Life Orb or Specs depending on your the last move slot.
-Shadow Ball
-Heat Wave/Flamethrower
-Energy Ball
-Trick/Momento

A Quiet Nature also works well in tandem with Trick Room, for speed control.

I don't really see what you're trying to accomplish with the set you posted. Chandelure is frail so there's no real use for Flash/Double Team especially if you're only investing in HP which isn't its best stat, and Shadow Ball> Dark Pulse because STAB and they virtually hit the same things super effectively.