Altaria-Mega @ Altarianite
Ability: Pixilate
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Return
- Earthquake
- Dragon Dance
- Roost

Nihilego @ Focus Sash
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Power Gem
- Toxic Spikes
- Stealth Rock
- Sludge Wave

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 160 Def / 92 SpD / 4 Spe
Calm Nature
IVs: 0 Atk
- Volt Switch
- Hydro Pump
- Will-O-Wisp
- Pain Split

Amoonguss @ Black Sludge
Ability: Regenerator
EVs: 252 HP / 184 Def / 72 SpD
Calm Nature
IVs: 0 Atk
- Spore
- Giga Drain
- Hidden Power [Fire]
- Clear Smog

Krookodile @ Choice Scarf
Ability: Moxie
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Knock Off
- Earthquake
- Pursuit
- Stone Edge

Latias @ Dragonium Z
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Psyshock
- Roost
- Defog

mega altaria is good