Tyranitar Sand Balance
If this isn't actually balance feel free to correct me.
https://pokepast.es/85bd04e004c31418
https://pokepast.es/85bd04e004c31418
I made this team earlier this week and have found success with it on the ladder, so I thought I'd share it on here. As of the time that this is written, I'm currently sitting at 49th on the ladder with 1555 points thanks to this team.
Overview
When I was making this team, I was working around the idea to use Tyranitar's sand in order to wear down the opposing team for my offensive threats while being resilient to sand myself. Thus, I built my team around an offensive core of Garchomp and Alakazam, since both are immune to sand and are able to take down each others checks and counters. Since I was planning on using sand, I obviously added Tyranitar afterwards, and then focused on my team's defensive backbone. I chose Scizor, Heatran, and Milotic to be the defensive backbone of the team, since the first two are both immune to sand and were useful defensively for the team. Milotic was used to patch up the team's defensive weaknesses, which I'll explain later.
Team Members
: When making the team I knew immediately I wanted Tyranitar to be my team's rocker, since it's able to threaten common defoggers Gliscor and Scizor with Ice Beam and Fire Blast respectively. I decided to simply take the Stealth Rock sample set since it fit my needs perfectly 
: Despite running an offensive set, I chose Heatran for it's defensive qualities against mons such as Scizor, Clefable, and Togekiss to name a few. Flame Body was chosen in order to attempt to burn Scizor's trying to U-Turn out of the match, though this does make the opposing Heatran match up worse. For the moves I chose the classic Magma Storm + Taunt + Earth Power combo since it lets Heatran trap mons such as Clefable and Blissey which would otherwise prove troublesome for the team's offensive core. Overheat was chosen mainly for the fact that it can KO Gliscor after Magma Storm, even SpDef sets. Otherwise it was chosen for a more powerful and more accurate fire move.
: I chose Scizor to be the team's Defogger, so I went with a SpDef spread that let it check mons that the team would have trouble switching into otherwise, such as Alakazam and Specs Latias. Thus Scizor has more opportunities to Defog away the hazards that the opposing team has set. On top of that, it's slow U-Turn helps bring in Garchomp and Alakazam as safely as possible, thus being able to keep up the pressure on the opposing team. I went with a Sassy nature and 30 speed IVs in order to get a slower U-Turn than other minus speed nature Scizor. In essence, it's your basic SpDef Scizor set.
: The first of the team's offensive core, I chose Garchomp because of its great STAB combination, sand immunity, and speed. Sand nullifying Leftovers recovery in conjunction with Stealth Rocks helps Chomp break past its checks and counters easier than it would be able to otherwise. While one would think that an SD set would fit best on this team, I chose to give my Garchomp a Choice Scarf instead. I found that the team was lacking in speed and would otherwise have troubles against opposing Scarfers and speed boosting setup sweepers like DD Dragonite, and that Scarf Garchomp patched these holes nicely. Choice Scarf also allows Garchomp to be an excellent cleaner late game once the opposing team is worn down sufficiently. For its moveset, I chose the basic EQ + Outrage combo for high BP STAB moves, Dual Chop for a low commitment dragon type STAB option that also breaks Focus Sash on the likes of Alakazam, and Stone Edge in order to hit the likes of Togekiss who would otherwise wall this set. 
: The second half of the team's offensive core, I chose Alakazam due to its immunity to passive damage, high speed, and great special attacking prowess. I find that Zam works well alongside Chomp due to its ability to greatly threaten Chomp's checks and counters like Clefable and Slowbro. With a Nasty Plot Life Orb 3 attacks set, Zam is the team's wallbreaker, weakening and breaking past walls so that Scarf Garchomp can clean up late game. Life Orb was chosen over Focus Sash because I felt that the team's defensive core was strong enough that the security provided by Focus Sash wasn't worth the power drop of not running Life Orb. Nasty Plot was chosen to break past the opposing team's walls even easier, and I felt that running Psyshock over Nasty Plot wasn't really worth it since that move only hits Blissey decently anyways. Alakazam can have trouble with SpDef Scizor and Blissey, of course, which is why I paired it with the aforementioned Heatran.
: The final member of the team, I wanted something that could deal with the likes of Weavile, Feraligatr, BD Azumarill, and bulky setup sweepers, since those were the teams major defensive weak point. I had decided that a bulky water type would be a good fit for this role, but I had not originally chosen Milotic. I had originally chosen a PhysDef Gastrodon with Clear Smog to deal with these mons, since it was also immune to sand. On top of that, its immune to water and electric, making it an amazing counter to Rotom-Wash. I kept Gastrodon since it worked very well, but I changed it to Milotic earlier today since it did Gastrodon's job better, due to an Ice neutrality for Weavile, access to Haze which has more PP than Clear Smog and bypasses Substitute, as well as higher SpDef to check Nidoking which the team struggled with otherwise. The set has 8 speed EVs in order to outspeed Belly Drum Azu and Haze away its boosts, with everything else put into HP and Defense. Ice Beam is on the set in order to hit grass and dragon types, while also hitting Gliscor harder than Scald. While Milotic is the sole team member affected by sand, I find that it fits the team much better than Gastrodon did.Replays
https://replay.pokemonshowdown.com/gen8bdspou-1649731127
https://replay.pokemonshowdown.com/gen8bdspou-1649638618
: The team's primary breaker, Latias' specs Draco Meteor threatens pretty much everything that isn't a Fairy type, specially defensive Steel type, or Blissey and Slowking. Specs Psychic gives Latias a spammable STAB option to hit Fairy types and other Psychic-weak mons without the drawback of Draco Meteor. Surf is mainly on this set to hit Heatran, as even SpDef Heatran gets 2HKO'd by specs Surf after rocks. Surf also gives Latias an option to hit Tyranitar without dropping its SpAtk. Lastly, Sleep Talk is on this set to take advantage of Breloom's Spore which would otherwise greatly annoy this team.
: The team's sweeper, DDance Dragonite can easily break through teams after getting the opportunity to boost once or twice, so long as there isn't a healthy Clefable or Quagsire on the other team. Extreme Speed also gives the team some valuable priority, which can help against Weavile, as it dies to +1 ESpeed after rocks. Lum Berry is the item of choice to give Dragonite setup opportunities on mons like Rotom-Wash who would want to status Dragonite.
: Magnezone does Magnezone things. You try and bring it in with a double switch or U-turn on a steel type like Skarmory or Scizor coming in, and then proceed to KO them. Zone also provides the team a powerful STAB Flash Cannon to demolish Fairy Types, as well as pivoting with Volt Switch. Not much else to say about Magnezone really.
: The team's 'glue' so to speak, Jirachi provied many things for the team. It provides Stealth Rocks, safe pivoting with U-Turn, speed control with Thunder Wave, and a way to deter Fairy types from switching in a Dragon type attack with Doom Desire. It generally acts as a buffer between the opposing teams threats (mainly special attackers) and the rest of its teammates.
: The final member of the team, I wanted something that could handle Weavile yet still pose an offensive threat, so I chose Azumarill. I chose your standard Band Azu moveset, but with Facade over Superpower to let Azu be a threat even if it were to get burned. For its EVs, I chose to invest enough speed to outspeed uninvested Tyranitar and put the rest into HP so Azumarill could take hits slightly better.
Mew's expert belt set serves to take advantage of the tremendous coverage it has access to and foces the opponent to try and scout out their moveset. Earthquake is there for Heatran who generally comes in on Mew for free and serves to delete Heatran instantly which I replaced over Focus Punch for those who remember me using it during OLT, it also instantly deletes Magnezone which flamethrower does not. Energy Ball beats water types primarily and Ice Beam hits a lot of things super effectively. Flamethrower is for Scizor mainly. Mew also has an extremely customizable moveset where it can change up the coverage it wants to run or even run Nasty Plot. Mew can also be a great attacking lead with this set since the opponent has to try and scout out it's moveset. Ebelt also means opponents can not hope to simply let it wear itself down. This set, unfortunately, struggles against Unaware Clefable but this is where some of its teammates come in.
Mixed Nidoking does what it does best which is to break bulky cores and force guesses from opponents. It's not the easiest thing to use or bring in but it is very rewarding when you can get it in on a double. Ice Beam is pretty self-explanatory, Sludge Wave usually OHKOs Clefable and Earth Power is reliable ground STAB. Focus Punch is mostly for Blissey which otherwise walls it. Unfortunately, Focus Punch requires prediction because Nidoking isn't able to get Superpower for some reason but it will allow Nidoking to kill Blissey with Sludge Wave afterward. 
The Choice Scarfer for this team that does a great job at revenge killing and punching holes into the opposition. It 2HKOs most clefable and gliscor variants and many offensive mons can not come in safely. However it's major flaw is that Staraptor will wear itself down over the course of a game and is best used as a cleaner. However, it can also be a good lead that can pivot to safely scout or dent a hole early on. 
The classic Unaware Clefable that has been a staple in this metagame forever. It is the rocker of this team and wish-tect is standard stuff. Clefable is mostly there to deal with the dragons of this tier like Dnite and Garchomp, it's the other glue of this team and can provide cleric support. to give teammates like Mew and Nidoking extra longevity on switches. 
: The team's big breaker, it can already cleave through many teams defensive cores alone. Even offensive mons who are slower than Heracross get smashed hard, letting it have some sort of use against any team with a bulky wall or slow pivot. Being able to destroy Slowbro and Tangrowth with Megahorn, as well as being able to cleanly 2HKO Skarmory with CC and Clefable with Facade makes it easier for Garchomp to sweep late game. It can have trouble against more offensive teams, however, and can be straight up deadweight against full blown HO.
: Heracross' favourite partner on the team, Future Sight Slowbro is a great pivot that enables its wallbreaking capabilities even further. Future Sight also helps in breaking Heracross' best answer on stall, the (albeit rare) Neutralizing Gas Weezing. Being able to counter and check a lot of physical attackers in the tier, namely Infernape, Staraptor, and Garchomp, while healing with Regenerator is also really nice for this team. Calm Mind lets Slowbro bolster its weaker SpDef stat to let it help check more mons in the tier while also letting it become a potent win condition in its own right.
(with Thunderbolt): Starmie without Thunderbolt can be dealt with rather easily by a healthy Slowbro. But a Starmie that carries Thunderbolt can be quite the threat, and needs to be played around carefully with some good pivoting.
: More of an annoyance than an actual threat to the team, Trick Scarf shenanigans can be annoying for the team since nothing really wants to be tricked a Scarf.
: A relatively reliable rocker, Blissey may be a momentum loss but stops Alakazam from completely running over the team. Despite being a para spam team this set does not run T-wave but rather healing wish to revive crucial mons depending on the matchup. Most often this is Infernape as it does not appreciate coming in on rocks and killing itself with flare blitzes, though you could just as easily store it for later or revive Nidoking or one of the electric walls, namely the recovery-lacking Rotom-wash. 
: While not as common in BDSP as it is in SwSh due to the lack of heavy duty boots, defensive Zapdos is still a reliable pivot and utility mon. A high base speed allows Zapdos to outspeed jolly Breloom with little investment and punish it by threatening to paralyze it with discharge or static contact. Being speedy also allows Zapdos to quickly u-turn out after defogging on switch-ins that Zapdos cannot touch like Gliscor or Blissey.
: You should not bring Aggron out until mid-game at the earliest, but once it is in, and it can set up on a respectable amount of the meta, Aggron instantly becomes very threatening to many teams, even if their checks are still healthy due to its powerful dual stab and earthquake coverage. Usually, you will be setting up on the likes of Clefable, Scizor, Blissey, Azelf, Jirachi, Celebi, and occasionally Latias (especially after it draco's something else) or even Staraptor if it's not locked into Close Combat. 204 speed EVs allows Aggron to outspeed the likes of Alakazam after a rock polish and begin threatening KOs. I'll leave some calcs below.
: Banded Infernape is a great way to gain momentum in a game and keep opponents trapped in volt/turn hell. Banded u-turns, blitzes and close combats primarily weaken checks to Nidoking and Aggron, and punish paralyzed Latias hard. It is also the offensive check for offensive threats to the team like Weavile and Breloom, making it the most common benefactor of Healing Wish. Due to an otherwise general lack of priority and speed on the team without setup, I would not recommend losing mach punch for thunder punch coverage. 
: While Weavile does not want to lock into crash vs. rotom or throat chop vs. zapdos, it still forces an uncomfortable position as rotom lacks recovery and infernape lacks bulk.
: Keep rotom alive. Just keep it alive at all costs. 
: While both Infernape and Nidoking outspeed and threaten to KO it, you should be careful to not allow it to come in on the likes of Blissey or Rotom. Zapdos will almost always beat it due to its resistance of both STAB but you will likely have to sac something to spore in order for it to win the 1v1. 
: Despite the sniper set being the obvious choice from team preview, sniper Kingdra still fits well into the current BDSP meta and is capable of muscling through almost any team other than full stall. Often times you might not even need to double dance, as agility will help you break through or at least weaken offensive teams and focus energy is often all that is needed for fatter/balance teams. Kingdra also has a good defensive typing and natural bulk that allow it to freely set up in front of the likes of Heatran, Rotoms, offensive water types (especially choice-locked ones), and even Clefable, as a sniper crit Hydro Pump has a 93.8% chance to OHKO standard phys. def sets and Moonblast will do max 83%.
: Standard scarf Celebi set tbh. Gains momentum, baits in Heatran, deals damage with leaf storm, cleans up weakened teams with psychic but mostly provides healing wish support to this team. Often times I will set up with Kingdra early to break and once it's either weakened or status'd healing wish into it to allow it to set up again and sweep.
: Ol' reliable. Tanks physical hits for days, gets up hazards and is one of 2 hazard removers for the team. Knock is also crucial for removing choice scarfs from Washtoms who might come in on it so that they cannot trick Kingdra or Dnite when they try to set up.
