Originally Posted by Cune
, they are not
(lol, hyperlinks are fun
The possibility for this was out there, and may still be, considering certain factors.
One---In the Generation One installation of the games, a Technical Machine existed for the move "Mimic". Most Pokemon were able to utilize this move (Caterpie, Weedle, Magikarp, Ditto, Metapod, Kakuna are notable unable).
Two---Considering the above, this may be able to be utilized, though obviously not with realistic results (Mewtwo Mimicking Chatot's Chatter move, Lucario Mimicking Ho-oh's Sacred Fire, Wailord Mimicking Mothims Camoflage).