Kyurem-Black @ Life Orb
Ability: Teravolt
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Ice Beam
- Earth Power
- Iron Head/Fusion Bolt
- Roost

Garchomp @ Life Orb
Ability: Rough Skin
EVs: 8 HP / 248 Atk / 252 Spe
Jolly Nature
- Dragon Claw
- Earthquake
- Swords Dance
- Fire Fang

Lopunny-Mega @ Lopunnite
Ability: Scrappy
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Return
- Quick Attack/Power-Up Punch
- High Jump Kick
- Fake Out

Tangrowth @ Assault Vest
Ability: Regenerator
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
- Leaf Storm
- Knock Off
- Earthquake
- Hidden Power [Ice]

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 128 Def / 132 Spe
Bold Nature
IVs: 0 Atk
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split

Heatran @ Leftovers
Ability: Flash Fire
EVs: 244 HP / 12 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Lava Plume
- Toxic
- Stealth Rock
- Taunt

Reasons for changes:
Your team looks really good, and I can see exactly what you are trying to do with Mega Lopunny + Kyurem Black. My main problem is that it struggles vs Clefable, which admittedly is almost impossible to eliminate as a threat. It also is slightly overreliant on Mega Lopunny and Kyurem Black to beat teams. I suggest running LO SD Garchomp > Tankchomp. LO SD Garchomp is regarded as the best Garchomp set by a lot of top level players, because it is almost impossible to switch into. Rotom Wash and Lando-T get lured in, and suprisingly it 1v1s Clefable Rocky Tangy after it uses Sleep Powder and Hippowdon. It is virtually unstoppable after it sets up, and can only lose to revenge killers or your opponent has to sac his Rotom to fire off a wisp, and that can get chipped. I recomend using quick attack mega lopunny here as everything in your team bar it, and heatran deal with it, and lando t cannot switch into heatran, while weavile is a problem, as well as other priority users. Garchomp also beats also Power-Up Punch targets.I have slashed iron head on kyurem black, as your team deals comfortably with fusion bolt targets (wash deals with azu, tran and wash deal with talon, fusion bolt doesnt 2hko mega slowbro and you have tangrowth wash and toxic on tran, worst case scenario, av tangrowth deals with manaphy , wash and heatran deal with skarmory) while  Clefable is still a issue, but if he is thunder wave clefable, you could even switch into garchomp, as clefables would not predict the Garchomp switch, but the heatran switch, so its kinda up to you. the speed on wash allows it to deal with adamant bisharp and even stuff like volcanion/breloom, because of the replacement of tankchomp.

note: the wash set is to outspeed stuff that try to creep jolly 70s, like some lando sets, while the garchomp hits a lo number.