Mewtwo should only use Recover on the Stall set. Mewtwo can just destroy nearly anything after a Calm Mind boost. There are still some checks but they have to be wary of certain moves. Examples will be Giratina does not enjoy taking boosted Ice Beams while Jirachi gets owned by Fire Blast.
<&GreatSage> if nothing else it's a "trickroom teaches pokemon" thread
<&GreatSage> which is reason enough to keep it
<@Colonel_M> I once heard Jibaku considered Scarf Gyarados for his Ubers team
<syrim> Trickroom the ultimate synguuest