Hey everyone I don't really post RMT that much as I'm a bit of a lurker, getting ideas from here and there on building my own unique teams and once i do build them I'm usually very satisfied.Anyway now that introduction is out the way my initial thought process on building the team was around Hoopa-U.
Hoopa-Unbound

Hoopa-Unbound @ Choice Band
Ability: Magician
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Hyperspace Fury
- Gunk Shot
- Fire Punch
- Zen Headbutt
I knew Hoopa was a very powerful anti-meta mon as it 2HKO most the meta after rocks or prior damage that being the main reason i wanted to build around him, I went with the physical band variant asit's my personal favorite. Hyperspace puts in work vs Celesteela trying to protect and most the meta except maybe defensive Lando-T.Gunk shot is mainly for the the tapu's and greninja if needed,Fire punch is very important as it allows me to break past bulky steels such as Ferro,Scizor,Magearna and it does decent damage to celesteela,Zen is mostly for Venusuar and Toxapex as they're pretty annoying for my team.
Tapu-Koko

Tapu Koko @ Electrium Z
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunderbolt
- Taunt
- Hidden Power Ice
- U-turn
My next member is Koko as it pairs great with Hoopa allowing me to saftley switch in Hoopa on potential switches and gain momentum. I decided to go with the special Electric-Z as i felt more confortable with this set as the physical is mainly used to catch AV Magearna off surprise and i felt i didn't need it because i have Hoopa and other memebers on the team to deal with Magearna.The set is very standard I generally Bring this in to bait out a lando or Magearna switch and U-turn out into a Hoopa or my own Lando depending the choice of switch. Electric-Z is also a very good move to weaken troublesome mons early on or late in the game.
Scizor

Scizor @ Scizorite
Ability: Light Metal
EVs: 248 HP / 44 Atk / 16 Def / 200 SpD
Impish Nature
- Swords Dance
- Roost
- Bullet Punch
- U-turn
I originally starded off with Defensive Defog Scizor, but many people from Showdown suggest I use SD Scizor or HP ice to better my MU with Zygarde and give me a win con for late game.This set is actually back from 6th gen and it's the one i generally use on my Scizor's.I generally bring this in late game and SD so clean up or Mid game to tank hit's and U-turn out to gain momentum or BP depending on how weakened they are. Overall Scizor has great synergy with Koko and Hoopa.
Mantine

Mantine @ Leftovers
Ability: Water Absorb
EVs: 248 HP / 136 Def / 124 SpD
Calm Nature
IVs: 0 Atk
- Roost
- Scald
- Haze
- Defog
My team was starting to look very weak vs Volcarona and Ash/Greninja so i added Mantine as my defogger and primary counter to them. Roost for longevity, scald is mainly to cripple mon's with burn or general damage and i went with Haze over toxic seeing as my heatran already carried toxic to cripple mons and I needed it to get rid of any boosted stats from Quiver dance Volc, Defog because i don't want Koko or Hoopa getting weakened by Spikes or Rocks.
Lando-T

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Earthquake
- U-turn
- Hidden Power [Ice]
- Knock Off
I originally had scarfChomp on this slot for Zygarde and Koko but many people on the ladder suggested i change it to scarfLando because chomp gets stuffed by many mons and not having acess to U-turn and intimate it was also another EQ immunity was really enough to make me drop Chomp for Lando. Scarf Lando is not very popular atm since most are either fly-Z or defensive so i catch many Koko's off surprise with earthquake, U-turn yet again to keep the pressure and momentum up vs my opponent. HP ice for Zygarde and opposing landorus, Knock was opted over explosion and stone edge simply because it helps my MU versus stall much more efficiently, knocking off lefties from Celesteela or eviolite from chansey.
Heatran

Heatran @ Leftovers
Ability: Flash Fire
EVs: 212 HP / 44 Def / 252 Spe
Timid Nature
IVs: 0 Atk
- Stealth Rock
- Toxic
- Magma Storm
- Earth Power
I needed a SR user and since Lando was a more offensive variant i opted with Heatran as it has great synergy with Scizor and Hoopa covering their weaknesses pretty well it also allowed me to trap annoying Pokemon with Magma Storm. Earthpower for coverage, Toxic to cripple mons and weaken them for scizor or hoopa to clean and SR manditory for Zard Y and for hoopa to 2HKO the meta.
Team weaknesses
Rain, not unbeatable but does require a lot of predictions
Medicham
Zygarde, If it manages to get +2
etc
Rain, not unbeatable but does require a lot of predictions
Medicham
Zygarde, If it manages to get +2
etc