John:

Tapu Lele @ Choice Scarf
Ability: Psychic Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Psyshock
- Hidden Power [Fire]
- Moonblast
- Energy Ball

Mienshao @ Choice Scarf
Ability: Reckless
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- High Jump Kick
- Poison Jab
- U-turn
- Rock Slide

Cofagrigus @ Leftovers
Ability: Mummy
EVs: 248 HP / 8 Atk / 252 Def
Impish Nature
- Haze
- Toxic Spikes
- Memento
- Knock Off

Landorus-Therian @ Choice Scarf
Ability: Intimidate
EVs: 80 HP / 148 Atk / 84 Def / 196 Spe
Jolly Nature
- Stealth Rock
- Earthquake
- Stone Edge
- U-turn

Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Soft-Boiled
- Cosmic Power
- Stored Power
- Charge Beam

Gyarados @ Gyaradosite
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Dragon Dance
- Waterfall
- Crunch
- Earthquake

Below this was late:
I started off with toxic spikes and cofag, why waste a moveslot when cofag get tspikes and seems like the best role for it in ou. I decided to use cofag as a item elimenator with knock combined with haze to get rid of set up stats. Then i thought why not give me a way to get some set up and put my opponent in a bad spot. Dropped momento in last slot to make cofag a real bitch lol. Then reckless gave me alot of trouble in ou bc everymon with the ability has a better ability. Tried staraptor with double edge band and scarf put some holes in things but dies so easily ecspecially after rocks. Tried rhyperior but really didnt like how slow it was without solid rock. Then finally ended with meinshao that clicked with that nice hjk damage output with reckless. Although regen uturn is nice it helps alot for the team with scarf poison jab for denting tapus and serperiors set up ass. Then put rock slide for coverage that has payed off. I tried a few different mons to pair with these guys and really liked tapu lele stopping priority. Went with psyshock for hitting the spd bulky types and with terrain hits hard enough on defensive types. I tried psy z but like the speed from scarf. Went hp fire for the switch in steel types ofcourse moonblast and then after testing found energy ball to come in handy vs alot of teams.
Mega gyra has turned out to be a monster! Come in with intimidate  on things like spd cele and can set up before mega taking heavy slams and get greedy to +3 or 4 then destroying. Love setting up in front of unaware clefable before mega taking moonblast then mega mold break unaware and bop!
Then i searched and ran across this magic guard clefable set that can destroy teams by itslef if they are prepared. Paired well with lele terrain and charge beam getting those extra boost while hurting bulky water types and cele while getting set up.
Then for my last mon i needed rocks and after trying a few rockers i like double intimidate and lando t being lando just seems to fit on every team. I wanted scarf even tho i needed rocks. Combined the 2 and uturn to pack 2 uturners . Went stab stone edge for the power and eq to take out steel types that threaten me.
This team has had many members and have found this madness of mons to actually have a good synergy for more reasons than i could describe. Actually a fun team in the end.