A team that I found to work well on pokemon online so far. it's ou (to their meta, could be wrong with a few things but not much.)
it jumped my wins ever since i started playing this specific team, sure the evs are kind of funky, but it works precisely how i like it to be played.
let me know if i should change anything major in this set besides the poke itself, unless you have a good alternative :p i'm just saying.
Dark Pulse has redundant coverage with Gengar's Ghost STAB in Shadow Ball. Get rid of it and replace it with Taunt (to stop walls from setting up), Substitute (to give Gengar a safety blanket on a predicted switch; the item should be Black Sludge should you choose to use it), or Destiny Bond (to give Gengar a shot of bringing an opponent down with it when it's about to get KOed). Gengar is fine with Ghost/Poison/Fighting coverage.
I honestly think Cacturne sucks. It's slow and frail at the same time and has plenty of common weaknesses. If you want a better Dark Sucker Punch abuser, there's Bisharp, which has a better set of resistances to take advantage of and can act as a backup Fairy killer when needed:
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit/Swords Dance
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe or 252 Atk/52 SDef/204 Spe
Item: Life Orb/Black Glasses/Dread Plate/Lum Berry
Ability: Defiant
or
-Sucker Punch
-Iron Head
-Knock Off
-Pursuit
Nature: Adamant
EVs: 192 HP/220 Atk/96 Spe
Item: Assault Vest
Ability: Defiant
If you still want something that absorbs Water attacks, Gastrodon is a better alternative because it only has one weakness to exploit:
-Scald
-Earthquake/Ice Beam
-Toxic
-Recover
Nature: Relaxed/Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Storm Drain
or
-Curse
-Scald/Waterfall
-Earthquake
-Recover
Nature: Sassy/Careful
EVs: 252 HP/112 Def/144 SDef
Item: Leftovers
Ability: Storm Drain
There are better revenge killers than Tauros out there. Yes, it has Sheer Force to make its attacks stronger, but that doesn't justify its use, IMO. Therian Landorus or Wash Rotom should be in its place, as either can bring in Camerupt safely with U-turn or Volt Switch, respectively, if they go last. This is helpful, as Camerupt is both slow and frail, a bad combination of traits to have in a Pokemon:
Therian Landorus:
-Stealth Rock
-Earthquake
-Stone Edge/Rock Slide/Knock Off
-U-turn
Nature: Impish
EVs: 252 HP/240 Def/8 SDef/8 Spe
Item: Leftovers/Rocky Helmet
Wash Rotom:
-Volt Switch
-Hydro Pump
-Will-o-Wisp
-Pain Split/Rest
Nature: Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers/Chesto Berry
Though Mega Camerupt isn't the best Mega to use in OU, due to its sluggish Speed, it has its perks of hitting insanely hard. It doesn't need Flash Cannon, as Fire Blast is strong enough to hit Fairy Pokemon, while Earth Power allows Mega Camerupt to hit Azumarill hard on the switch. While it's true that Flash Cannon hits Mega Altaria, that's all it's good for and you should have teammates to cover it (like Bisharp and Gengar). Replace Flash Cannon with Will-o-Wisp, Toxic (to burn/poison incoming switch-ins), or Stealth Rock (the most important entry hazard ever).
I suggested Bisharp as a Steel Pokemon, so I don't think Metagross will be needed here. A Fighting Pokemon that can break through Chansey, such as Terrakion, is more helpful:
-Swords Dance
-Stone Edge
-Close Combat
-Rock Polish/Substitute
Nature: Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb
or
-Stone Edge
-Close Combat
-Rock Slide
-Iron Head/X-Scissor/Toxic
Nature: Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Choice Scarf
Noivern was a decent Pokemon in the early stages of Gen VI, but it's not nowadays because there are too many Dragon Pokemon that do its role better. Dragalge has the same base Special Attack as Noivern, but hits harder with Adaptability-boosted attacks. Adding it would increase the team's weakness to Ground Pokemon, though. Though Hydreigon is slower than Noivern, it hits harder and has a wider movepool to take advantage of. Latias and Latios are also stronger than Noivern, but they're also decently fast (albeit slower than Noivern as well) and can provide Defog support to get rid of opposing entry hazards:
Hydreigon:
-Dark Pulse
-Draco Meteor
-Flash Cannon
-Fire Blast/Superpower
Nature: Modest/Mild
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
or
-Dark Pulse
-Draco Meteor
-Earth Power/Fire Blast
-Flash Cannon
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf
Latias:
-Draco Meteor
-Psyshock/Hidden Power (Fire)
-Defog
-Healing Wish/Roost/Recover
Nature: Timid
EVs: 72 HP/184 SAtk/252 Spe
Item: Life Orb
Latios:
-Draco Meteor
-Psyshock
-Hidden Power (Fire)/Earthquake/Roost/Recover
-Defog/Roost/Recover
Nature: Timid/Hasty
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb
or
-Calm Mind
-Draco Meteor
-Psyshock
-Surf/Recover/Roost
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb
or
-Draco Meteor
-Psyshock
-Defog/Hidden Power (Fire)
-Trick
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf