The Teams that I have been using in the paste 5 weeks almost all of them were in the range of 1550- 1710
Revaroom + Mega Gyarados HO
Landorus-Therian (M) @ Focus Sash  
Ability: Intimidate  
Tera Type: Ground  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Taunt  
- Stealth Rock  
- Earthquake  
- Explosion  

Tapu Koko @ Light Clay  
Ability: Electric Surge  
Tera Type: Electric  
EVs: 248 HP / 4 Def / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Taunt  
- Reflect  
- Light Screen  
- Volt Switch  

Salamence (M) @ Heavy-Duty Boots  
Ability: Moxie  
Tera Type: Dragon  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Dual Wingbeat  
- Earthquake  
- Stone Edge  

Gyarados-Mega (M) @ Gyaradosite  
Ability: Mold Breaker  
Tera Type: Water  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Crunch  
- Waterfall  
- Substitute  

Volcarona @ Heavy-Duty Boots  
Ability: Flame Body  
Tera Type: Bug  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Quiver Dance  
- Fire Blast  
- Psychic  
- Bug Buzz  

Revavroom @ Firium Z  
Ability: Filter  
Tera Type: Steel  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Shift Gear  
- Gunk Shot  
- High Horsepower  
- Temper Flare  

Standard HO with a bit of Heat. Lando lead with Koko screens to prevent rest and sleep inducing moves. Salamence is DD but with stone edge to destroy birds like Zapdos and Moltres with flying stab Dual Wingbeat and EQ and moxie helps. Mega Gyara is standard with sub and has got mold breaker + soft checking Gambit and Dragapult. Standard Volc but with psychic as we cannot afford to give Toxapex room here and Bug Buzz for Roaring Moon. Revaroom is firium to blow up Corv and steels. 
Mega Sceptile + Salamence sand 
Sceptile-Mega (M) @ Sceptilite  
Ability: Lightning Rod  
Tera Type: Grass  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Leaf Storm  
- Dragon Pulse  
- Giga Drain  
- Focus Blast  

Salamence (M) @ Choice Specs  
Ability: Intimidate  
Tera Type: Dragon  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Fire Blast  
- Hydro Pump  
- Air Slash  

Tyranitar (M) @ Choice Band  
Ability: Sand Stream  
Tera Type: Rock  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Stone Edge  
- Pursuit  
- Ice Punch  
- Earthquake  

Excadrill (M) @ Steelium Z  
Ability: Sand Rush  
Tera Type: Ground  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Swords Dance  
- Earthquake  
- Iron Head  
- Rapid Spin  

Iron Crown @ Choice Scarf  
Ability: Quark Drive  
Tera Type: Steel  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 20 Atk  
- Volt Switch  
- Tachyon Cutter  
- Psychic Noise  
- Focus Blast  

Azumarill (F) @ Assault Vest  
Ability: Huge Power  
Tera Type: Water  
EVs: 52 HP / 252 Atk / 204 Spe  
Adamant Nature  
- Liquidation  
- Knock Off  
- Play Rough  
- Aqua Jet  

Fun team to try out. I earlier used a version of Booster Valiant and Baloon Rocks train but we were struggling against fighting types. So hence had to add an Azumarill and Scarf Crown for more initial speed. Specs Salamence is amazing lure for the bulky birds, Corv, Ferro and Lando. It does so much to Alo that Alo will be in the range soon. AV Azu is to help against Zard Y to an extent and scarf Lele. Tyrainitar is banded and hits hard but it did the least work apart from setting sand on the team sadly. Excadrill won late game after a boost. Mega Sceptile helps out for sand by being a source of speed control dealing with Koko, Mega Lopunny and Dragapult and has reasonably good special attack. AV Azu is the fairy to prevent kommo-o from going stupid. 
Mega Manetric team 
Manectric-Mega (M) @ Manectite  
Ability: Intimidate  
Tera Type: Electric  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Volt Switch  
- Thunderbolt  
- Overheat  
- Hidden Power [Ice]  

Dragonite (M) @ Heavy-Duty Boots  
Ability: Multiscale  
Tera Type: Dragon  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Dual Wingbeat  
- Earthquake  
- Ice Spinner  

Iron Crown @ Choice Scarf  
Ability: Quark Drive  
Tera Type: Steel  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 20 Atk  
- Volt Switch  
- Psychic Noise  
- Tachyon Cutter  
- Focus Blast  

Muk-Alola @ Assault Vest  
Ability: Poison Touch  
Tera Type: Poison  
EVs: 240 HP / 252 Atk / 12 SpD / 4 Spe  
Adamant Nature  
- Knock Off  
- Gunk Shot  
- Pursuit  
- Fire Punch  

Great Tusk @ Rocky Helmet  
Ability: Protosynthesis  
Tera Type: Ground  
EVs: 32 HP / 208 Atk / 16 SpD / 252 Spe  
Jolly Nature  
- Rapid Spin  
- Stealth Rock  
- Headlong Rush  
- Ice Spinner  

Ogerpon-Wellspring (F) @ Wellspring Mask  
Ability: Water Absorb  
Tera Type: Water  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Swords Dance  
- Play Rough  
- Ivy Cudgel  
- Power Whip  

Tried to make Mega Manetric work but got mixed results. Its speed is nice but not enough. Overheat is his selling point.  Alolan Muk is the pursuit trapper. Great Tusk is our physical attacker, rocker and spinner. Wellspring is the stall breaker for the team. Iron Crown is scarf to snipe Diancie, Zamzenta and other unknown threats. Dragonite is the sweeper/cleaner for the team. 
Quadruple starter offence 
Sceptile-Mega (M) @ Sceptilite  
Ability: Lightning Rod  
Tera Type: Grass  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Giga Drain  
- Dragon Pulse  
- Focus Blast  
- Leaf Storm  

Feraligatr (M) @ Life Orb  
Ability: Sheer Force  
Tera Type: Water  
EVs: 64 HP / 252 Atk / 192 Spe  
Adamant Nature  
- Liquidation  
- Crunch  
- Ice Punch  
- Aqua Jet  

Infernape (M) @ Choice Scarf  
Ability: Blaze  
Tera Type: Fire  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- U-turn  
- Flare Blitz  
- Close Combat  
- Switcheroo  

Zapdos @ Flyinium Z  
Ability: Static  
Tera Type: Electric  
EVs: 72 HP / 252 SpA / 184 Spe  
Timid Nature  
IVs: 0 Atk  
- Hurricane  
- Thunderbolt  
- Roost  
- Heat Wave  

Iron Treads @ Life Orb  
Ability: Quark Drive  
Tera Type: Ground  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Stealth Rock  
- Earthquake  
- Ice Spinner  
- Rapid Spin  

Greninja-Bond (M) @ Life Orb  
Ability: Battle Bond  
Tera Type: Water  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
- Dark Pulse  
- Hydro Pump  
- Ice Beam  
- Sludge Wave/ Water Shuriken

So i made this frail quadruple starter offence team. But it worked out on the ladder in the sense that I made top 500 on its peak was 1694. 3 of my favourite starters are on this team - Mega Sceptile, Feraligatr and Infernape. Mega Sceptile has the same standard special attacking 4 attacks set using his speed in the situations.  Infernape is scarfed as a speed control along with switcheroo + stabs + Pivoting. Feraligatr is 4 attacks which allows it to take physical hits better with that HP investment and strike back. Zapdos is flyinium Z and speed is to outspeed Lando-T. Greninja can be a devastating cleaner but I have had to switch between Sludge Wave and Shuriken. The other 3 moves on Gren are mandatory. I was regularly above 1600 with this. But warning the stall match up is a disaster and you will be better off skipping the game against stall but since was stall was so rare when I laddered I felt i could manage it. Treads is there due to his amazing typing + utility. 
Lastly Zard X + Feraligatr
Excadrill @ Focus Sash  
Ability: Mold Breaker  
Tera Type: Ground  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Stealth Rock  
- Earthquake  
- Toxic  
- Rapid Spin  

Charizard-Mega-X (M) @ Charizardite X  
Ability: Tough Claws  
Tera Type: Fire  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Flare Blitz  
- Earthquake  
- Outrage  

Feraligatr (M) @ Life Orb  
Ability: Sheer Force  
Tera Type: Water  
EVs: 16 HP / 252 Atk / 4 SpD / 236 Spe  
Jolly Nature  
- Dragon Dance  
- Liquidation  
- Crunch  
- Ice Punch  

Revavroom @ Firium Z  
Ability: Filter  
Tera Type: Steel  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Shift Gear  
- Gunk Shot  
- Temper Flare  
- High Horsepower  

Tapu Koko @ Light Clay  
Ability: Electric Surge  
Tera Type: Electric  
EVs: 248 HP / 4 Def / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Reflect  
- Light Screen  
- Dazzling Gleam  
- Taunt  

Latios (M) @ Weakness Policy  
Ability: Levitate  
Tera Type: Dragon  
EVs: 84 HP / 172 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Calm Mind  
- Agility  
- Stored Power  
- Aura Sphere  

Feraligatr is my favourite water starter so I built around it and I wanted to try DD with screens. I feel it has good synergie with Zard X. It can take out or seriously hurt Great Tusk,Lando and Gliscor and create the pathway for a Zard X sweep. Standard Feralligatr set with speed to outspeed Zamazenta at +1. Excadrill is sash lead with rocks and toxic + spin. Zard X is a standard DD + 3 attacks for a strong outrage. Dragon Rush was another side consideration. Koko is standard screens with a fast taunt. Revaroom is someone who I really like on HO and its set covers a lot. Latios is a  potenitally dangerous threat in the late game with WP agility + calm mind + stored power. The bulk investment is to live a play rough from Wellspring and a moonblast from Val at full. I had 2 games with this in 1600+ and we reached 1710. 
So thats all there is from me here and I hope you have fun using these teams and a great future ahead.