Board Thread:Pokemon Arena X - In-game News/@comment-5398529-20140531005346/@comment-5537612-20140601185236

Unowns are kind of pliable, so yes they can move their "legs", or whatever other extremeties they may possess.

However, it's really not worth the money to make individual animations for each unown form, and their pliability doesn't translate well to bricks, so instead they just float up and down rythmically.