Just a list of random ones.
-I think Starmie will have its two layers of stars spinning interchangeably, for example, the front star will spin once or twice, then the same will happen for the back star.
-Chatot will most likely have its head bobbing back and forth along with its tail, like a metronome.
-Jigglypuff will probably puff up every once and a while, and Clefairy will probably be making a wagging motion with its fingers.
-Spinda will be doing a funny dance in place... as though it were dreadfully intoxicated...
-Lapras will probably be making a swimming motion with its fins, also moving its neck back and forth every once and a while.
-Wobbuffet will... probably just put its arm over its head and then put it down again... lather, rinse, and repeat...