Originally Posted by Fat Lorak
It also seems, though I'm not 100% positive, that through over 400 tests, the Mew tutor did not select two or more XD-exclusive Mew tutor moves to generate for a moveset. This does not apply to tutored moves learned in XD (Self-Destruct, Sky Attack, etc.), where one or more could be found on the movesets; rather, it is for things such as Hypnosis and Zap Cannon.
I'm not 100% sure on this, but I think the move tutor selects from a list of sets, not individual moves. For example, when I was trying to teach my event Mew Hypnosis, he offered to teach it Mega Punch/Ice Punch/ThunderPunch/Fire Punch.
I think I came across Hypnosis twice, once with Dream Eater, and once with Nightmare (I'm not sure on the Dream Eater one, but I can confirm that I decided on Hypnosis/Nightmare/Swagger/Protect). Nightmare was directly after Hypnosis, too.
I really doubt that those sets are a coincidence (come on, the 'classic' four punches on one set?).