Haxorus @ Lum Berry
Ability: Mold Breaker
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Outrage
- Close Combat
- Poison Jab
- Dragon Dance
I chose Haxorus for its high attack stat and decent speed stat. Lum berry is to prevent status and give opportunities to get a dragon dance off. Outrage is for a powerful stab, close combat 2 hits corv and skarm with +1 and destroys heatran and ferrothorn, poison jab is to hit fairies like fini and clefable, and dragon dance is boost haxorus' attack and speed.
Landorus-Therian @ Focus Sash
Ability: Intimidate
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Explosion
- Swords Dance
- Stealth Rock
Landorus is here to set stealth rocks and deal damage, with either earthquake for targets weak to it and ghosts, or explosion for everything else. focus sash lets lando survive one hit and either set up rocks or explode. Swords Dance is there to boost lando's attack to terrifying levels. The 252 attack and speed is there to maximize what this lando is good for, hitting hard and fast while setting rocks.
Garchomp @ Life Orb
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Scale Shot
- Earthquake
- Fire Fang
This garchomp is the typical sd scale shot set with nothing to special to say about it. The only thing that might be unique about this set is fire fang of stone edge for steels such as corv, who don't care about chomp's stabs on this set, even at +2. I might change it out for stone edge as it still 2 hit kos, but has lower accuracy.
Melmetal @ Assault Vest
Ability: Iron Fist
EVs: 40 HP / 252 Atk / 104 SpD / 112 Spe
Adamant Nature
- Double Iron Bash
- Superpower
- Ice Punch
- Thunder Punch
Melmetal is here to patch up this teams fairy weakness with double iron bash, which also has a 60% to make the target flinch due to hitting twice. Super power hits fellow steels, ice punch for dragons and lando, and thunder punch for pex. The ev spread as well as assault vest lets it survive atleast one hit from many special attackers such as speck dragapult.
Latios @ Choice Specs
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Ice Beam
- Draco Meteor
- Psyshock
- Aura Sphere
Honestly the shakiest member of this team in my opinion, I'm thinking of switching it out for another special attacker, maybe an electric type of some kind. The specs let it hit hard from the start with ice beam hitting fellow dragons with 100% accuracy, draco meteor is for a powerful stab attack, psyshock hits specially defensive targets, and aura sphere hits steels hard.
Tapu Lele @ Choice Scarf
Ability: Psychic Surge
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psyshock
- Moonblast
- Focus Blast
- Psychic
And finally tapu lele, who's psychic surge is able to prevent priority attacks from stopping the sweeps of chomp and hax. The scarf lets it outrun dragapult and revenge kill it. The double psychic stab is for different situations, psyshock for specially defensive targets and psychic for raw power. Moonblast for fairy stab and to hit dragons, and focus blast to chunk steel types.
Ability: Mold Breaker
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Outrage
- Close Combat
- Poison Jab
- Dragon Dance
I chose Haxorus for its high attack stat and decent speed stat. Lum berry is to prevent status and give opportunities to get a dragon dance off. Outrage is for a powerful stab, close combat 2 hits corv and skarm with +1 and destroys heatran and ferrothorn, poison jab is to hit fairies like fini and clefable, and dragon dance is boost haxorus' attack and speed.
Landorus-Therian @ Focus Sash
Ability: Intimidate
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- Explosion
- Swords Dance
- Stealth Rock
Landorus is here to set stealth rocks and deal damage, with either earthquake for targets weak to it and ghosts, or explosion for everything else. focus sash lets lando survive one hit and either set up rocks or explode. Swords Dance is there to boost lando's attack to terrifying levels. The 252 attack and speed is there to maximize what this lando is good for, hitting hard and fast while setting rocks.
Garchomp @ Life Orb
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Scale Shot
- Earthquake
- Fire Fang
This garchomp is the typical sd scale shot set with nothing to special to say about it. The only thing that might be unique about this set is fire fang of stone edge for steels such as corv, who don't care about chomp's stabs on this set, even at +2. I might change it out for stone edge as it still 2 hit kos, but has lower accuracy.
Melmetal @ Assault Vest
Ability: Iron Fist
EVs: 40 HP / 252 Atk / 104 SpD / 112 Spe
Adamant Nature
- Double Iron Bash
- Superpower
- Ice Punch
- Thunder Punch
Melmetal is here to patch up this teams fairy weakness with double iron bash, which also has a 60% to make the target flinch due to hitting twice. Super power hits fellow steels, ice punch for dragons and lando, and thunder punch for pex. The ev spread as well as assault vest lets it survive atleast one hit from many special attackers such as speck dragapult.
Latios @ Choice Specs
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Ice Beam
- Draco Meteor
- Psyshock
- Aura Sphere
Honestly the shakiest member of this team in my opinion, I'm thinking of switching it out for another special attacker, maybe an electric type of some kind. The specs let it hit hard from the start with ice beam hitting fellow dragons with 100% accuracy, draco meteor is for a powerful stab attack, psyshock hits specially defensive targets, and aura sphere hits steels hard.
Tapu Lele @ Choice Scarf
Ability: Psychic Surge
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psyshock
- Moonblast
- Focus Blast
- Psychic
And finally tapu lele, who's psychic surge is able to prevent priority attacks from stopping the sweeps of chomp and hax. The scarf lets it outrun dragapult and revenge kill it. The double psychic stab is for different situations, psyshock for specially defensive targets and psychic for raw power. Moonblast for fairy stab and to hit dragons, and focus blast to chunk steel types.
is a very efficient lead for this kind of teams. Haxorus 
is a not a common choice, but can have an interesting niche in offensive teams because of Mold breaker that allows him to nuke things like Unaware Clefable. However, I feel that it does a very similar job than Garchomp 
and even though both are good options here, I wouldn’t use them at the same time. Tapu Lele 
in duo with Latios 
form an interesting core with both some Speed control and some breaking power and can fit well in this kind of team. As for Melmetal 
, it’s an interesting choice but you can probably find a slightly better Steel type here while keeping the idea that you need a Dragapult check.
: So as I mentioned it, I don’t think you want to have both Haxorus and Garchomp, as they have very similar roles. I would suggest replacing Garchomp, but you can keep it and change Haxorus if you want. Haxorus can’t be revenge kill easily by Weavile as Ice Shard won’t kill without Defense drops and may be a bit less predictable than Garchomp as it is less common. Anyway, to replace one of these two setter sweepers, I would suggest using another threatening sweeper that loves to be paired up with Tapu Lele: Hawlucha. Hawlucha is a great cleaner in Hyper offense teams, it can use Taunt to shut down a lot of defensive Pokemon and brings a very good Speed Control option to deal with Pokemon that threaten you offensively. You can run the classic spread that allows you to take one Moonblast from Clefable as you don’t need to maximize your Speed to outspeed all unboosted Pokemon in the tier. Close Combat and Acrobatic are the two STAB of choice and I would put Taunt as a last move, because I feel that it helps against way more things that Stone Edge (you can prevent Hippowdon from using Whirlwind or Toxic, prevent Toxapex from using Haze, prevent Corviknight or Skarmory from using Iron Defense and so on while Stone Edge is only truly useful for the very uncommon Zapdos). Here is the set:
: Melmetal is a cool offensive Pokemon, but I think that Bisharp could be slightly better here. You probably need to test and see if it’s really efficient in practice, but in theory Bisharp is really good in this kind of team. It brings an anti-Defog tool with Defiant, is much more threatening than Melmetal as it can setup a Swords Dance and use one of the best priority move in the game. Sure, you have a Tapu Lele with Psychic Surge which will require to use Bisharp and Tapu Lele wisely to not end up in a situation where you need to Sucker Punch, but you can’t, but I think it should be manageable. Bisharp is also a good one- or two-time check to both Weavile and Dragapult even if it takes slightly more damage on both. Here is the set (rather have Black Glasses to avoid Life Orb chip damage and keep being able to switch in on Dragapult):
Corviknight is a huge problem for this team, with the team lacking any way to reliably handle it. 
Kartana also is a mon that essentially always gets a kill every time it switches in, and can easily snowball into a loss. 
Ferrothorn is also very problematic for half the team, and we lack any consistent switch-in or answer to it. 
Slowbro was a huge nuisance, hard walling most of our team (
) and we were left with no safe switch-ins. The only way to handle this mon is essentially hope that we still had 
Rillaboom (reset terrain so Hawlucha couldn't get going, superpower hits Melmetal extremely hard) 
Toxapex (walls half the team, scald burns/ haze threaten set up sweepers, can easily pressure lele with toxic/ passive damage) and 
Rain Teams in general
Magnezone