Hey there! Your team looks pretty decent as far as its composition goes. The glaring issue with this team is that most of your sets are completely off, so I'll go ahead and first list the sets you should be using with this team and have the changes in bold.
Serperior @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Leaf Storm
- Dragon Pulse
- Hidden Power Fire
- Giga Drain
Serperior should run max Special Attack over max HP in order to maximize its offensive capabilities. Personally, I think that Life Orb is a better item on Serperior since it allows for it to deal more damage and score some OHKOs against some pokemon after a boost such as Latios. Dragon Pulse allows you to hit bulky Dragon types such as the Lati twins and Dragonite, which would otherwise wall Serperior. Hidden Power Fire allows it to hit steel types such as Ferrothorn, Scizor, and Magnezone which would also wall Serperior without it. Finally, Giga Drain is used as a better form of recovery for Serperior given its role as a sweeper.
Azumarill @ Sitrus Berry
Ability: Huge Power
EVs: 92 HP / 252 Atk / 164 Spe
Adamant Nature
- Belly Drum
- Aqua Jet
- Play Rough
- Knock Off
This EV spread allows for Azumarill to outspeed pokemon with 70 base speed or below and with uninvested speed EVs, such as Tyranitar and Clefable, while retaining as much bulk and attack as possible. Aqua Jet should be used over Waterfall because Azumarill is very slow and a +6 Aqua Jet can still do a lot of damage, especially once your opponent's team is weakened which should be something to prioritize before using Belly Drum. Knock Off should be used over Hidden Power Ice because first of all, Azumarill has a horrible special attack stat and its attack with the ability Huge Power is the reason for using it. Secondly, Knock off provides better coverage. Sitrus Berry is to give Azumarill more health to help it sweep after it uses Belly Drum.
Talonflame
Ability: Gale Wings
EVs: 248 HP / 252 SpD / 8 Spe
Careful Nature
- Acrobatics
- Roost
- Bulk Up
- Will-O-Wisp
For Talonflame, I recommend running the stallbreaker set because it gives you a switch-in to Mega Charizard Y as well as helping you a bit more versus stall and Fairy types. Roost is needed on Talonflame for recovery, Bulk Up helps it sweep and break through physical attackers that can survive an Acrobatics, and Will-O-Wisp can put a dent into physical attackers and can also help it set up with Bulk Up.
Landorus-Therian @ Leftovers
Ability: Intimidate
EVs: 252 HP / 240 Def / 8 SpD / 8 Spe
Impish Nature
- Earthquake
- U-turn
- Stone Edge
- Stealth Rock
For Landorus-Therian, I recommend the defensive set. Assault Vest isn't a very good item on Landorus-Therian; Leftovers allows it to gain some passive recovery. The EV spread allows for Landorus-Therian to outspeed Modest Magnezone and survive a Hidden Power Ice from Mega Manectric with the rest of the EVs going into its defenses. Impish Nature should be used over Adamant to further improve its bulk. Landorus-Therian is a better hazard setter than Mega Metagross so Stealth Rock should be used on this. Stone Edge is used so it can hit flying types such as Talonflame and Tornadus-Therian.
Metagross @ Metagrossite
Ability: Clear Body
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Meteor Mash
- Zen Headbutt
- Hammer Arm
- Pursuit
You didn't list an EV spread for Mega Metagross so just in case, it should be running max Speed and max Attack for utilizing its offensive prowess. Magnet Rise is an unneccessary move on Mega Metagross since you should never keep it in on a ground type move in the first place and it's taking place over a useful coverage move. As I mentioned earlier, Mega Metagross isn't a good stealth rocker since it's used as a wallbreaker and therefore, doesn't have room for a support move like Stealth Rock. Meteor Mash is essential as a STAB move for Mega Metagross. Hammer Arm hits steel types such as Ferrothorn and Heatran. Bullet Punch doesn't seem necessary on this team since it doesn't struggle with revenge killers, so I decided to replace it with Pursuit. Latios and Latias could be a bit problematic once Metagross goes down since Azumarill doesn't want to take hits from Psyshock in order to preserve its health so it can use Belly Drum and nothing else wants to switch into it. By using Pursuit, Mega Metagross has the opportunity of switching in on a Draco Meteor or Psyshock and using Pursuit as Latios or Latias tries to switch out, dealing a lot of damage to them in the process.
Finally, Scolipede doesn't seem necessary on this team since your team is already fast and most of your physical attackers can already set up so baton passed boosts aren't needed. In addition, you have no defogger on this team which is bad with Talonflame since it's 4x weak to Stealth Rock which means that every time it switches in, it loses half its HP. Another problem is that your team struggles with bulky waters once Serperior goes down. Your team is also a bit weak to bulky Gyarados since it can threaten your team after a boost. Bulky Gyarados can use Bounce to beat Serperior so Landorus-Therian is the only thing that can take it on and it has a good chance of 2HKOing defensive Landorus-Therian at full health, while Landorus-Therian only has a small chance of 2HKOing bulky Gyarados with Stone Edge if Landorus-Therian's Attack has been dropped by Intimidate and even then, there's the chance of Stone Edge missing.
220 Atk Gyarados Waterfall vs. 252 HP / 240+ Def Landorus-T: 194-230 (50.7 - 60.2%) -- 86.7% chance to 2HKO after Leftovers recovery
-1 0 Atk Landorus-T Stone Edge vs. 88 HP / 4 Def Gyarados: 160-190 (45.3 - 53.8%) -- 2.3% chance to 2HKO after Leftovers recovery
The best chance of getting rid of bulky Gyarados is if Landorus-Therian were to come in on Gyarados after something has fainted. Because of all this, Landorus-Therian is a bit of a shaky check to Gyarados and it's your only check. To help with everything I've mentioned, I'm going to suggest replacing Scolipede with Latios
Latios @ Life Orb
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Thunderbolt
- Defog
This Latios set may seem a bit odd with the Thunderbolt, but it's the best option for your team since you can already deal with steel types such as Ferrothorn and Mega Scizor well, so Hidden Power Fire isn't necessary. Heatran isn't an issue either so Earthquake isn't necessary as well. What Thunderbolt allows you to do is take on bulky Gyarados as well as other bulky water types. With Defog, you now have a way of clearing hazards so your team, and especially Talonflame, can switch in more safely to things. Also, the addition of Latios creates a Dragon-Fairy-Steel core with Latios, Mega Metagross, and Azumarill; this core is pretty useful along with the Fire-Water-Grass core you already have in dealing with the type matchups versus each type.
Hopefully this balances out the team a lot better! Good luck with your future battles!
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