doesn't lose to ash gren+lele

Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Moonblast
- Soft-Boiled
- Stealth Rock
- Thunder Wave

Venusaur-Mega @ Venusaurite
Ability: Thick Fat
EVs: 248 HP / 88 Def / 156 SpD / 16 Spe
Calm Nature
IVs: 0 Atk
- Sludge Bomb
- Giga Drain
- Hidden Power [Fire]
- Synthesis

Reuniclus @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 200 Def / 4 SpA / 56 SpD
Modest Nature
- Psyshock
- Shadow Ball
- Knock Off
- Thunder

Latios (M) @ Choice Specs
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Psyshock
- Trick
- Defog

Magearna @ Leftovers
Ability: Soul-Heart
EVs: 248 HP / 96 SpA / 16 SpD / 148 Spe
Modest Nature
IVs: 0 Atk
- Calm Mind
- Shift Gear
- Ice Beam
- Thunderbolt

Landorus-Therian (M) @ Rockium Z
Ability: Intimidate
EVs: 252 Atk / 252 Spe
Adamant Nature
- Substitute
- Swords Dance
- Earthquake
- Stone Edge