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Wow, the weird thing about your team is that some things are fine, but some things are really bad. Let's take a look at what's bad and try to make them good.
SCEPTILE
Everything is fine about this moveset except Swagger.
Never use Swagger because you'll basically end up helping your opponent. Confusion is unreliable and wears off quickly. And your opponent has a chance of not hitting itself at all which means that it gets to attack your team with a +2 boost in Attack. Use Hidden Power Fire instead (or Energy Ball if you can't get it).
SCIZOR
Nature problem!
Always use natures that decrease your least important stat. Lonely nature decreases Scizor's Defense, but Defense is not its least important stat. That would be Special Attack. So use an Adamant Nature instead.
All Pokemon need items as well. A Swords Dance Scizor works best with Life Orb.
As for moves, use Bug Bite over X-Scissor. Bug Bite gets boosted by Technician and becomes stronger than X-Scissor.
Brick Break over Night Slash, because without Brick Break, you can't handle Steel types.
DUSKNOIR
EV problem!
If you want to make a defensive, look at its HP compared to its Defense/Special Defense.
If HP < Defense/Special Defense, max out HP first (i.e. Shuckle, Dusknoir)
If HP > Defense/Special Defense, max out Defense/Special Defense first (i.e. Blissey, Vaporeon)
Pokemon with high defenses, but low HP will take less damage if you give it more HP EVs. Pokemon with high HP, but low defenses will take less damage if you give it more EVs in its defenses.
Since Dusknoir's HP is less than its Defense and Sp Defense, you should put 252 EVs into HP.
Trick Room isn't bad for Dusknoir, but it's bad for the rest of your team because your other Pokemon rely on Speed. You should never use Trick Room or weather effects if their are no other Pokemon on your team that benefit from it because you could end up hurting your team mates and cause you to lose.
Replace Trick Room with Earthquake. Also replace Shadow Punch with Shadow Sneak. Shadow Sneak always goes first and bypasses Dusknoir's low Speed.
GALLADE
Item problem!
NEVER ever use Focus Sash on a Pokemon that isn't in your lead position. Opponents will almost always use Stealth Rock or another entry hazard on their first turn. If you switch your Focus Sash wearer in, you will take damage and Focus Sash will fail since it only works when you're at 100% HP.
Bulk Up is okay, but Swords Dance is better. When a Pokemon learns both Swords Dance and Bulk Up, Swords Dance is almost always the better option since it boosts your Attack faster.
Also, don't use Drain Punch. It's way too weak. Use Close Combat. Close Combat is TWICE as strong as Drain Punch.
MILOTIC
Never ever use Attract. It's a bad move because it won't work over half the time due to your opponent being genderless or the same gender as you. A better status move would be Toxic.
Don't use Shell Bell either. It's a bad item because it only works if you damage the opponent. But if you don't use a damaging move or you are prevented from attacking, then it doesn't do anything. Use Leftovers instead because Leftovers always restores health no matter what you do.
FLYGON
Your Flygon's moveset is actually almost perfect, but you need to use Outrage over Dragon Claw since Outrage is 50% stronger and outweighs any negative side effects the move has.
Next, I'll talk about Pokemon you should replace.
First off, is Sceptile your lead Pokemon? If it is, then it's a bad lead. Most leads should focus on setting up with support moves like entry hazards (Stealth Rock, Spikes, Toxic Spikes), weather effects (Rain Dance, Sunny Day etc.) or screens (Reflect, Light Screen). Your Sceptile isn't doing any of that, so get rid of it.
A good Grass type lead is Roserade. It learns Toxic Spikes which is a nice entry hazard as well as Sleep Powder to shut down other leads.
Roserade @Focus Sash
Timid Nature
Natural Cure
4 HP / 252 SAtk / 252 Spd
-Leaf Storm
-Sleep Powder
-Toxic Spikes
-Hidden Power Fire/Sludge Bomb
Next, lets look at Gallade. While Gallade has fantastic Attack, the one thing that lets it down is its Speed which is only average. In OU tier, Gallade is generally outclassed by Lucario, who has less Attack but is faster and learns some better moves.
Lucario @Life Orb
Adamant Nature
4 HP / 252 Atk / 252 Spd
-Close Combat
-Extremespeed
-Crunch/Ice Punch
-Swords Dance
One of Lucario's major selling points is Extremespeed which allows it to take down faster opponents that most Fighting types can't handle.
Milotic is also a nice Water type, but its defenses aren't high enough to handle some of the physical attackers in OU. Swampert would be a better bulky Water and also learns Stealth Rock, another entry hazard your team needs.
Swampert @Leftovers
Impish Nature
252 HP / 6 Atk / 252 Def
-Earthquake
-Waterfall
-Stealth Rock
-Roar
In Short:
*Replace Sceptile with Roserade
*Replace Gallade with Lucario
*Change Dusknoir's EVs and moves
*Replace Milotic with Swampert
*Change Scizor's moves and add an item
*Give Flygon Outrage
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