Look at my pokemon team!

[LegitimateNebula]

Hey guys. Please don't judge my team since I'm quite a beginner. It would be awesome if you recommended changes, items and movesets.

LegitimateNebula's "King Team"
Wash Rotom, Tyrantrum, Aegislash, Wash Rotom, Scizor, Mega Mewtwo X, Blissey

What this teams basically supposed to do: Wash Rotom comes out and wipes out the pokemon or it volt switches. Tyrantrum and Aegislash supposedly kills the other pokemon. Now we're left with a Scizor, Mega Mewtwo X and a Blissey. Scizor uses swords dance and baton passes to Mega Mewtwo X. You're left with my wall (Blissey) and it does it's annoying things.

 

[PlatinumDude]

Full move sets would've been appreciated for each Pokemon.

Mega Mewtwo X is powerful enough that it doesn't need Attack boosts Baton Passed to it. It also has its own Attack-boosting move in Bulk Up. And it's an Uber, meaning you can't use it in standard play (Smogon OU, though it's okay in Wi-Fi/Battle Spot).

Wash Rotom should look like either of these:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Rest
Nature: Bold
EVs: 248 HP/216 Def/44 Spe
Item: Leftovers

or
-Volt Switch
-Hydro Pump
-Will-o-Wisp/Pain Split
-Hidden Power (Ice)/Thunderbolt
Nature: Modest
EVs: 228 HP/60 SAtk/220 Spe
Item: Leftovers

or
-Volt Switch
-Hydro Pump
-Hidden Power (Ice)/Thunderbolt
-Trick
Nature: Timid/Modest
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Scarf

Tyrantrum is really outclassed in OU because Tyranitar and Ferrothorn do what it can do better, whether it's Dragon Dancing, hitting threats hard or supporting the team:

Ferrothorn:
-Leech Seed
-Protect
-Gyro Ball/Thunder Wave
-Power Whip/Stealth Rock/Spikes
Nature: Relaxed/Impish
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers/Rocky Helmet
Ability: Iron Barbs

or
-Stealth Rock/Spikes
-Leech Seed
-Gyro Ball/Thunder Wave
-Power Whip/Protect
Nature: Relaxed
EVs: 248 HP/52 Def/208 SDef
Item: Leftovers
Ability: Iron Barbs

Aegislash should look like either of these ones:
-Substitute
-Toxic
-Shadow Ball
-King's Shield
Nature: Modest
EVs: 244 HP/252 SAtk/12 Spe
Item: Leftovers

or
-Shadow Ball
-Sacred Sword
-Iron Head/Shadow Sneak/Pursuit
-King's Shield
Nature: Quiet
EVs: 244 HP/252 SAtk/12 Spe
Item: Leftovers

or
-Shadow Ball
-Flash Cannon
-Sacred Sword
-Shadow Sneak/Pursuit
Nature: Hasty/Naive
EVs: 4 Atk/252 SAtk/252 Spe
Item: Life Orb/Spooky Plate/Spell Tag

or
-Swords Dance
-Shadow Sneak
-Iron Head/Shadow Claw
-Sacred Sword/Head Smash
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb

or
-Autotomize
-Shadow Ball
-Hidden Power (Ice)
-Sacred Sword/Iron Head/Flash Cannon
Nature: Rash/Modest
EVs: 124 Atk/252 SAtk/132 Spe
Item: Life Orb/Weakness Policy

As I said, Mega Mewtwo X is strong and fast enough that it doesn't have to rely on Baton Passing to succeed. Baton Pass Scizor is best played in dedicated Baton Pass teams, so I think Scolipede should be in this one:
-Megahorn
-Spikes/Toxic Spikes
-Swords Dance/Toxic Spikes
-Earthquake/Rock Slide/Baton Pass
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Focus Sash
Ability: Speed Boost

or
-Swords Dance
-Protect/Megahorn
-Substitute/Megahorn
-Baton Pass
Nature: Timid/Jolly
EVs: 248 HP/208 Def/52 Spe
Item: Black Sludge/Mental Herb
Ability: Speed Boost

Mega Mewtwo X should look something like this (take note you need Poke Bank and Black 2/White 2 for these moves):
-Low Kick
-Zen Headbutt/Earthquake
-Ice Beam/Stone Edge
-Taunt
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Mewtwonite X

or
-Bulk Up
-Drain Punch/Low Kick
-Zen Headbutt/Rock Slide
-Taunt/Rock Slide
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Mewotwonite X

Or if your opponents complain that you have a Mewtwo with you, settle for Mega Heracross. While it's significantly slower than Mewtwo, it appreciates the Speed boosts from Scolipede at the cost of making you more vulnerable to Talonflame:
-Pin Missile
-Close Combat/Swords Dance
-Rock Blast
-Earthquake
Nature: Adamant
EVs: 40 HP/252 Atk/216 Spe
Item: Heracronite
Ability: Moxie/Guts

The best Blissey can do is this:
-Aromatherapy/Heal Bell
-Seismic Toss/Flamethrower
-Soft-Boiled
-Toxic/Thunder Wave
Nature: Bold
EVs: 4 HP/252 Def/252 SDef
Item: Leftovers
Ability: Natural Cure

 

[Kakarot1212]

This is what I'll recommend for a sweeper aegislash:

-Shadow Sneak
-Sacred Sword
-Sword Dance/Iron Head
-King's Shield
Item: Leftovers/Life Orb/Assault Vest
Nature: Adamant
EV: 252 Atk/252 SAtk/4 HP or SpD
Ability: Stance Change

If you think you can get sword dance boost from scolipede, go for Iron Head. And never ever remove Kings Shield and Shadow Sneak on Aegislash, he relies on them, a 40 powered SS can do a lot of damage if used by aegislash.

And the other where explained by the dude above me.

 

[Nah]

Like Platinum said, Tyrantrum has its issues and is currently generally outclassed by other Pokemon, but if you still reeeeeeeeeeeally wanna use it, then use this set:

-Tyrantrum w/Lum Berry
Nature: Adamant/Jolly
Ability: Strong Jaw (Game Freak better release Rock Head for this thing sometime soon)
EVs: 252 Attack, 252 Speed, 4 HP
Moves: Stone Edge, Earthquake, Ice Fang/Thunder Fang, Dragon Dance