Protean By sussyamongusdrip (Mewtwo-Mega-Y) @ Life Orb  
Ability: Protean  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Sunsteel Strike  
- Moongeist Beam  
- Shell Smash  
- Freeze-Dry  

Protean By Glory (Mewtwo-Mega-Y) @ Life Orb  
Ability: Protean  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Sunsteel Strike  
- Moonblast  
- Moongeist Beam  
- Shell Smash  

PsySurge by Gold0987 (Mewtwo-Mega-Y) @ Focus Sash/Lum Berry  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Extreme Evoboost  
- Spore  
- Moongeist Beam  
- Photon Geyser  

Standard Support PsySurge (Mewtwo-Mega-Y) @ Terrain Extender  
Ability: Psychic Surge  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Photon Geyser/Light That Burns The Sky  
- Taunt  
- Stealth Rock  
- Sticky Web  

No Guard Coverage Spam (Mewtwo-Mega-Y) @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Photon Geyser  
- Shell Smash  
- Fissure/Sheer Cold 
- Zap Cannon/Megahorn/Inferno/Blue Flare 

Magic Guard Recoil Spam (Mewtwo-Mega-Y) @ Life Orb  
Ability: Magic Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Shell Smash  
- Mind Blown  
- Photon Geyser  
- Light of Ruin  

Sheer Force (theorymoned in phcord) (Mewtwo-Mega-Y) @ Life Orb  
Ability: Sheer Force  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Steam Eruption  
- Photon Geyser  
- Seed Flare  
- Searing Shot  

Sniper by Guysmash (Mewtwo-Mega-Y) @ Scope Lens  
Ability: Sniper  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
- Focus Energy  
- Photon Geyser  
- Earth Power  
- Bug Buzz  

ComaPhase (Mewtwo-Mega-Y) @ Choice Scarf  
Ability: Comatose  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sleep Talk  
- Whirlwind  
- Light That Burns the Sky/Menacing Moonraze Maelstr  
- Oceanic Operetta/Menacing Moonraze Maelstrom/10,000,000 Volt Thunderbolt

Shadow Tag CFZ Clicker (Mewtwo-Mega-Y) @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Trick  
- Light That Burns the Sky  
- Menacing Moonraze Maelstrom  
- Searing Sunraze Smash / note: you can use other cfzs  

Offensive Innards Out (Mewtwo-Mega-Y) @ Leftovers  
Ability: Innards Out  
EVs: 252 HP / 252 Atk / 252 SpA / 252 Spe  
Hasty Nature  
IVs: 0 Def / 0 SpD  
- Shell Smash  
- V-create/Close Combat/Clanging Scales  
- Photon Geyser  
- Sunsteel Strike/Moonblast/Bug Buzz  

Support Innards Out (Mewtwo-Mega-Y) @ Leftovers / Lum Berry  
Ability: Innards Out  
EVs: 252 HP / 252 Atk / 252 SpA / 252 Spe  
Hasty Nature  
IVs: 0 Def / 0 SpD  
- Photon Geyser / Stealth Rock / Spikes / Sticky Web / Knock Off  
- Taunt / Spore / Lovely Kiss  
- Volt Switch / U-turn / Parting Shot  
- Shore Up