Setup Sweeper (Mewtwo-Mega-Y) @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Sing / Grass Whistle / Lovely Kiss  
- Sheer Cold / Fissure  
- Photon Geyser  
- Shell Smash

 
Scarf revenge kill & wall breaker (Mewtwo-Mega-Y) @ Choice Scarf  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sheer Cold  
- Trick  
- Entrainment  
- Light That Burns the Sky / Photon Geyser

 
Outclassed normal no guard (Mewtwo-Mega-Y) @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Sing / Lovely Kiss / Taunt
- Entrainment / Photon Geyser / Zap Cannon / Magna Storm
- Fissure / Sheer Cold  
- Photon Geyser / Stealth Rock / Spikes

MMY

by Anson

MMY as a strong late Game sweeper is the main reason why it is good. Without the no guard ability it is already with scary 194 Spa, while no guard give it access to a nearly unstoppable sleeping move(safety googles is like 10 times common and useful than mbounce) and a button to delete annoying things like zygarde, it would be one of the most threatening sweepers in the meta game, as it can easily setup on those who is slower than it. And the ability to be improved is also valuable in the metagame because you would not want to let the impostor sweep your whole team. Any Yvetal can be a soft check of it, and a smooth improof can also be done by a toxic orb mguard or a mbounce set. Scarf revenge killer MMY is also a available choice. Tho its very much outclassed by deos or pheromosa at this point. The access to a sky high BP STAB with a sky high Spa is still making it different from those two mons. The normal no guard set is outclassed but theres no reason that you cant use it. More recommended on multi mmy team for surprise reasons.

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