I've caught the 'M and this is what happened to me:
1)Crashed my Hall of Fame, (Not much of a threat to me),
2)When I duplicated my Master Ball and deposited it, it said:
-Master Ball <9
-Master Ball <9
-Master Ball <9
-Master Ball <9
-Master Ball <9
-Master Ball <9
3)I gave it a Rare Candy and it evolved into a Kangaskhan and it's moves were:
-Water Gun
-Water Gun
-Sky Attack
And that's pretty much all that it did. I'm not sure about the Missing No. though.
Avatar made by me. Yeah! Go uhhh, Skariazutops!