Rate my team

I don't have a bunch of experience with ivs and evs any help will be great and without futher ado here's my team.

Name: Nien the Ninetails
Nature: Timid
Ability: Drought
Item: Wise Glasses
Ivs: 31 hp, 19 atk, 31 def, 31 sp atk, 31 sp def, 31 spd
Evs: 252 sp atk, 4 hp, 252 spd
Moves: Calm Mind, Flamethrower, SolarBeam, Extrasensory

Name: Metagross
Nature: Adamant
Ability: Clear Body
Item: King Rock
Ivs: 31 hp, 31 atk, 30 def, 16 sp atk, 30 sp def, 31 spd
Evs: 56 hp, 250 atk, 252 spd
Moves: earthquake, aerial ace, brick break/superpower, light screen/Bullet Punch

Name: Haxorus
Nature: Adamant
Ability: Mold Breaker
Item: Lum Berry
Ivs: 31 hp, 31 atk, 31 def, 19 sp atk, 31 sp def, 31 spd
Evs: 252 hp, 4sp def, 252 spd
Moves: Outrage, Dragon Dance, Brick Break, Earthquake

Name: Gengar
Nature: Timid
Ability: Levitate
Item: Black Sludge
Ivs: 31 hp, 11 atk, 31 def, 31 sp atk, 31 sp def, 31 spd
Evs: 252 sp atk, 4 hp, 252 spd
Moves: Thunderbolt, Focus Blast, Giga Drain, Shadow Ball

Name: Skarmory
Nature: Careful
Ability: Sturdy
Item: Leftovers
Ivs: 31 hp, 31 atk, 31 def, 16 sp atk, 31 sp def, 31 spd
Evs: 155 hp, 151 def, 252 sp def
Moves: Roost, Spikes, Stealth Rocks, Tailwind/Aerial Ace

Name: Swampert
Nature: Adamant
Ability: Torrent
Item: Black Belt
Ivs: 31 hp, 31 atk, 31 def, 31 sp atk, 31 sp def, 31 spd
Evs: 155 hp, 151 atk, 252 spd
Moves: Earthquake, Ice Punch, Waterfall, Protect

Might wanna give Ninetails the moveset of Fire Blast, Hypnosis, Calm Mind, and one of the HP types such as Ice or Rock for example. Solarbeam would be okay if it wasn't just screaming for Tyranitar or Politoed to switch in now.

For Metagross try a Choiced set with the moves Trick, Meteor Mash, Earthquake, and something along the lines of Bullet Punch or Explosion for a 4th move.

Haxorus should be Jolly or Adamant btw depending if you want more speed or more power, either one is fine regardless. It would also help if you posted the moveset for it lol.

Might wanna give Swampert the moveset of Stealth Rock, Earthquake, Roar, and Ice Beam with something along the lines of a Relaxed nature so it can be more of a team player. And for Gengar I'd give it a Life Orb so it can hit just a wee harder now.

That and for Skarmory I'd get rid of Stealth Rock for either Whirlwind or Taunt now, depends if you need to phaze something out or to stop premature entry hazards more.

Sorry for not being very descriptive but I hope this helps regardless.

Just saying, it's not important to say the IVs in the Competitive Team Help forum.

Ninetales isn't as effective as the other weather starters because of its Stealth Rock weakness and low Defense, so winning weather wars is very important:
-Flamethrower
-Will-o-Wisp
-Sunny Day
-Roar/Hypnosis/Substitute
Nature: Timid
EVs: 252 HP/120 Def/136 SDef
Item: Leftovers
Ability: Drought

or
-Sunny Day
-Fire Blast
-SolarBeam
-Nasty Plot/Hidden Power (Ice)/Will-o-Wisp
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Leftovers/Air Balloon
Ability: Drought

Since this is a Sun team, Metagross isn't a good fit, IMO, since the sun increases its susceptibility to Fire moves. And you need a Sun abuser or two; Heatran or Volcarona are just a couple examples.

Heatran:
-Fire Blast
-Earth Power
-Hidden Power (Grass/Ice)
-Stealth Rock/Taunt/Toxic
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Air Balloon

or
-Lava Plume
-Toxic
-Protect
-Earth Power/Stealth Rock/Roar
Nature: Calm
EVs: 248 HP/252 SDef/8 Spe
Item: Leftovers

or
-Sunny Day
-Magma Storm
-SolarBeam
-Earth Power/Hidden Power (Ice)
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Air Balloon

or
-Fire Blast
-Earth Power
-Hidden Power (Ice)/Dragon Pulse
-Overheat/Flamethrower
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Scarf

or
-Substitute
-Fire Blast
-Earth Power/Hidden Power (Ice)
-Toxic/Will-o-Wisp
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Leftovers

or
-Fire Blast/Overheat
-Earth Power
-Dragon Pulse/Hidden Power (Ice)
-Hidden Power (Grass)/Flamethrower
Nature: Modest/Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs

Volcarona:
-Quiver Dance
-Bug Buzz
-Fire Blast/Fiery Dance
-Hidden Power (Ground)/Giga Drain
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Lum Berry

or
-Quiver Dance
-Fiery Dance/Fire Blast
-Bug Buzz
-Roost/Morning Sun
Nature: Timid
EVs: 252 HP/240 Def/16 Spe
Item: Leftovers

or
-Quiver Dance
-Fire Blast/Fiery Dance
-Bug Buzz
-Rest
Nature: Modest
EVs: 160 HP/236 SAtk/112 Spe
Item: Chesto Berry

And as Xulek mentioned, never, ever, ever, ever, ever use Timid on Haxorus. You're just wasting away its massive Attack if you do that:
-Swords Dance
-Outrage
-Superpower/Low Kick
-Substitute/Earthquake
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Fighting Gem/Life Orb/Lum Berry
Ability: Mold Breaker


or
-Outrage
-Earthquake
-Superpower
-Dragon Claw/Dual Chop
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Band
Ability: Mold Breaker

or
-Dragon Dance
-Swords Dance
-Outrage
-Low Kick/Earthquake
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Lum Berry/Draco Plate
Ability: Mold Breaker

or
-Dragon Dance
-Outrage
-Earthquake
-Low Kick/Taunt/Dragon Claw/Dual Chop
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Lum Berry/Yache Berry
Ability: Mold Breaker

Other Dragons to consider are Dragonite, Salamence and Hydreigon because they have access to Fire moves to take advantage of Sun.:

Dragonite:
-Dragon Dance
-Outrage/Dragon Claw
-Fire Punch
-Earthquake/ExtremeSpeed/Roost
Nature: Adamant/Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Leftovers/Lum Berry
Ability: Multiscale

or
-Outrage
-ExtremeSpeed
-Fire Punch
-Earthquake/Superpower
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Band
Ability: Multiscale

or
-Draco Meteor
-Fire Blast/Flamethrower
-Thunder Wave
-Roost
Nature: Modest
EVs: 252 HP/252 SAtk/4 SDef
Item: Leftovers
Ability: Multiscale

Salamence:
-Outrage
-Dragon Claw
-Earthquake
-Fire Blast
Nature: Naive
EVs: 252 Atk/4 SAtk/252 Spe
Item: Choice Scarf
Ability: Moxie

or
-Dragon Dance
-Outrage/Dragon Claw
-Earthquake
-Fire Blast
Nature: Naive
EVs: 252 Atk/4 SAtk/252 Spe
Item: Lum Berry/Yache Berry/Life Orb

or
-Outrage
-Draco Meteor
-Fire Blast
-Earthquake
Nature: Naive
EVs: 64 Atk/252 SAtk/192 Spe
Item: Life Orb

Hydreigon:
-Draco Meteor
-Fire Blast
-Superpower
-Earthquake/Earth Power/Dark Pulse/Roost
Nature: Rash/Mild
EVs: 4 Atk/252 SAtk/252 Spe
Item: Expert Belt/Life Orb

or
-Substitute
-Dragon Pulse
-Focus Blast
-Fire Blast/Roost
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Leftovers/Life Orb

or
-Draco Meteor
-Fire Blast
-Focus Blast
-U-turn/Dark Pulse
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs

Given that Sun teams are susceptible to entry hazards, you need a way to control them. Donphan or Espeon are your best bets here; either can go over Swampert, since its Water STAB is weakened in sun. Donphan replaces Skarmory, while Espeon goes over Swampert:

Donphan:
-Earthquake
-Rapid Spin
-Stealth Rock/Head Smash/Stone Edge
-Ice Shard
Nature: Adamant
EVs: 252 HP/252 Atk/4 Spe
Item: Leftovers
Ability: Sturdy

Espeon:
-Reflect
-Light Screen
-Psychic/Psyshock
-Hidden Power (Fire)/Baton Pass
Nature: Timid
EVs: 252 HP/4 Def/252 Spe
Item: Light Clay
Ability: Magic Bounce

or
-Calm Mind
-Stored Power
-Hidden Power (Fighting/Fire)
-Baton Pass
Nature: Timid
EVs: 252 HP/4 SAtk/252 Spe
Item: Leftovers
Ability: Magic Bounce

I'm not sure why Gengar is on the team, but it needs some changes:
-Substitute
-Shadow Ball
-Focus Blast
-Disable/Thunderbolt/Hidden Power (Fire)/Pain Split
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Black Sludge/Life Orb

or
-Shadow Ball
-Focus Blast
-Hidden Power (Fire)
-Protect/Substitute
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Black Sludge