I would if I knew what you were asking.
To answer, to what I think you're saying, Mewtwo hasn't returned in any format, the special episodes, or anything past Mewtwo Returns. If Mewtwo were to return, given the older fanbase, they'd raise the flag as high and loud as they could get. They did with Mewtwo Returns.
Although he was conspiciously absent in the 8th intro, although...there is someone in shadows in an alley in the intro, before almost flying away, could be him. (Ironically the intro covered all the Legendaries, particularly Hoenn's, but Mewtwo and Lugia were absent).
Hope that helps.