Please Rate My First Competitive XY Team!

Question

Hey guys, I just finished EV training for the first time for a competitive team. I was on a winning streak, but its been a couple days and I can't stop losing. My interest is mostly in triple battles.

Goodra@Leftovers
252 HP/ 4 Atk/ 252 SpA
Nature: Sassy
Ability: Gooey
-Dragon Pulse
-Flamethrower
-Power Whip
-Sludge Bomb

RotomW@King's Rock
252 SpA/ 4 HP/ 252 Speed
Nature: Modest
Ability: Levitate
-Hydro Pump
-Thunderbolt
-Trick
-Will-O-Wisp

Skarmory@Wide Lens
224 HP/ 252 Def/ 32 SpD
Nature: Impish
Ability: Sturdy
-Spikes
-Roost
-Aerial Ace (looking to replace, possibly Flash Cannon?)
-Night Slash

Tyranitar@Quick Claw
252 Atk/ 252 Speed/ 4 HP
Nature: Jolly
Ability: Sand Stream
-Rock Polish
-Crunch
-Stone Edge
-Earthquake

Starmie@Shell Bell
252 SpA/ 252 Speed/ 4 HP
Nature: Timid
Ability: Natural Cure
-Grass Knot
-Surf
-Thunderbolt
-Ice beam

Mawile@Mawilite
252 HP/ 252 Atk/ 2 SpD
Nature: Adamant
Ability: Intimidate
-Rough Play
-Sucker punch
-Iron Head
-Stone Edge

I've been told that I need more synergy between my team, especially striving in triple battles. I need a lot of advice, thank you all in advance!

Comments

There are only a few things wrong with your team, so this isn't necessarily an answer.
1)King's rock on rotom?
2)Skarmory should have stealth rock, spikes, whirlwind, and roost/brave bird and leftovers
3)T-tar doesn't run that set very well, may I suggest aerial ace instead of rock polish and maxed HP EVs with leftovers?
4) may I also suggest substitute or swords dance over stone edge on mawile?

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There are a few things wrongs like the guy above/below said.
-Rotom wash with kings rock?
-I run a leftovers skarmory with spikes, whirlwind, roost, and brave bird.
-I don not think that a quick claw t-tar with rock polish would be a good idea. Try replacing it with stealth rocks, and maybe leftovers.
-your mawile is fine, but i dont like the moveset. Try swords dance, play rough,sucker punch, and iron head.
Overall, your team seems pretty good.