So I'll be submitting two teams that I have been using a decent amount in Natdex.
Triple Steel Team
So this is an old team, created before September (when the SV DLC released, I wish that showdown showed when you created teams) and it still works even now. The main idea is to use the steel core of m-aggron, heatran and ferrothorn (and gliscor too, they are an honourary steel) to wall most of the meta while chipping them down, to allow Z Tapu koko and specs hydreigon to clean up.
The cornerstone of the team, mega aggron can basically wall anything it wants to on the physical side. Heavy metal as the base ability does mean that aggron's heavy slam is more powerful than m-aggron's against heavier targets (it does 37% minimum to garg, while m-aggron does 22%, a big difference). Heavy slam of course is stab and allows m-aggron to deal great damage. Toxic allows it to pressure some opponents that might take its hits, taunt make it able to shut down any bulkier mons or status effects, and bp deals great damage and helps with steel types.
The top dog, gliscor helps wall any ground types that may threaten the team while being a great offensive mon. Tera steel of course lets it pretend to be part of the squad, letting it wall ice types. Roost gives gliscor longevity and immediate healing while earthquake deals great damage to a lot of teams. Counter is an interesting option, allowing gliscor to potentially live a hit and ko a pokemon outright if they hit on the physical side. Finally, knock off can remove the opponents items and make spikes be more troublesome.
A defensive wall, ferrothorn gives support for the team with leech seed and can wall many mons. Tera water of course is a good defensive tera for ferrothorn, allowing it to take fire type moves really well. Leech seed gives ferro more recovery and can force switches or give teammates recovery. Body press of course take ferro's great defense stat and turns it into a weapon. Seed bomb was chosen over power whip due to its consistency, while gyro ball will be doing a lot of damage due to ferro's low speed stat.
This heatran set is a little interesting and uses assault vest, an item I think works amazingly on heatran. A mega diancie earth power does 88% max and a lando-t earth power with max special attacks evs can never OHKO you, doing 99.4% max and 84% minimum. Of course, you wouldn't be switching it into this hits, but this is to show how bulky on the special side heatran is. Magma storm of course is for stab and earth power is basically neccessitated on heatran. Flash cannon is also a good stab move and hidden power grass allows heatran to deal with opposing water or ground types. Tera bug is an amazing defensive type, allowing heatran to resist fighting and ground, while only being weak to flying and rock.
The fast cleaner of the team, tapu koko can apply tons of pressure onto the opposing team. Tera flying allows it to avoid any ground type moves that may be aimed at it. U-turn gives the team some pivoting options and doesn't get stuffed by ground types. Thunderbolt and dazzling gleam are good stab options. Toxic gives koko a sort of safe click button, allowing it to directly deal with ground types. Electrium Z allows Tapu Koko to break through some bulkier targets that it might otherwise struggle with.
The wallbreaker of the team, specs hydreigon is able to output absurd amounts of damage. Tera steel is a great defensive typing against fairies and boosts the power of flash cannon. Draco meteor is a great stab move that can annihilate anything that isn't resisting it or immune to it, for reference assault vest toxapex takes 50% from it minimum. Dark pulse is also a good stab move, while flash cannon annihilates any fairy types that might try to switch into its stab moves. Finally, earth power destroys most steel types, allowing it to again use its stab moves.
Mega Slowbro and Breaking Swipe Gliscor Stall
This is quite a unique stall team here for NatDex. It uses two unique mons. Mega Slowbro and Breaking Swipe Gliscor, to try and hard wall a lot of physical attackers, meaning the rest of the team can wall the special side.
The special tank of the team, blissey of course can wall anything it wants to. Tera dark allows it to deal with stored power users or psyshock users, which is always valuable. Soft boiled is of course for recovery, while calm mind allows it to boost up alongside special threats. Seismic toss deals good damage and shadow ball deals with ghost types immune to shadow ball.
The first innovation of the team, mega slowbro can fill a variety of roles on the team. At first, it can use regen in order to pivot in and out of hits, and then mega evolve to get the extra bulk and wall more things in the late game. Scald of course is a good stab move and when mega'd, it can deal good damage while spreading burns. Slack off allows slowbro to have some recovery when it mega's, meaning it can't be chipped as easily. Iron defense makes slowbro able to wall basically anything on the physical side and if only physical threats are remaining, that can be a game over. Ice beam allows slowbro to deal with dragons or grasses that resist scald.
Ferrothorn is the spikes setter of the team that can rack chip damage quite quickly on the opponent. Spikes of course applies pressure to the opposing side of the field, leech seed deals chip damage and heals ferro and toxic deals even more chip to the opponent. Gyro Ball is the damaging move on the set, dealing suprising damage for a mon that is more about passive damage and deals with the most common magic bounce user, M-Diancie. However, if you are worried about hatterne, then slot in heavy slam, since gyro ball doesn't do a lot of damage otherwise.
The second innovation of the team, breaking swipe gliscor can wall a lot of things in the tier. At -1 attack, not to many hits are going to be breaking through. For reference, a -1 icicle crash from a 252+ mamoswine only has a 6.3% chance to OHKO. The 130 attack stat, 85 bp stab move that is 4x effective doesn't have a good chance to OHKO. A waterpon ivy cudgel doesn't even 2hit ko. This means any neutral hit will bounce right off. Gliscor can get these impressive numbers while attacking, meaning it isn't passive. Protect allows it to be annoying while accumulating health, poison jab deals with fairy types that are immune to breaking swipe and knock off removes items to allow damage to be more permanent. Tera steel is just a good defensive typing.
Another defensive behemoth, toxapex can trap opponents and remove them from the game. Tera grass means it can resist ground type moves, which is a good trait to have. Scald helps spread burns and makes sure that toxapex isn't passive. Knock off can remove lefties from the opposing team, making its damage a lot more permanent. Baneful bunker can help spread poison damage onto any opponent that makes contact and allow for a bit of extra chip. Infestation traps opponents and means that they can be chipped down be pex's other moves as well.
The defogger of the team, zapdos I will admit is probably the most replacable of the team (moltres is a good alternative). However, it can spread status on opposing mons that make contact and can give some pivoting to the team. Tera water is a good defensive typing for it, resisting ice moves that may be aimed at it. Defog of course removes hazards, which mega slowbro loves. Roost gives it reliable recovery. U-turn helps it pivot out of bad matchups such as against ground types and discharge does good damage and can spread paralysis.
This Pokemon is reserved for try hards, a lot of times you will find yourself just clicking knock off when facing off against zamazenta but being able to remove items from bulky waters who wall you and later can be wittled down by spikes makes this mon fantastic with dual hazards. Additionally being a dark type and utilizing hdb gives it potential to take an important hit at least once a game which makes this mon extremely valuable to this team.
scarf lando is so versatile, its value cannot be expressed through words. Offensively it can clean late game with stab eq and generally its a pretty solid revenge killer. Due to its offensive presence it can have free turns to defog or u-turn. Scarf lando of course has many great lead match ups and finally Id like to mention its defenive utility is still very present throughout each game because of intimadate and its excellent typing.
I know its awkward slotting tapu lele on a team with double priority buuuuuuuuuuuuuuut nothing. It is weird but i think its worth the awkaward moments from time to time, especially since weavile doesnt click shard that much for me to care that much. Lopunny not being able to fakeout can suck, no denying that. 
great match up into hyper offense and can be great vs fat if you can kncok switch ins and pressure them with hazards. 
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