Read it. Think about it. What do you notice that will make shuckle almost uber in the near future? Now, as this was not enough-
Though not nearly as good, think of all the applications. Any moves that lower the stats- and gen V has created quite a few, as well as moves like leaf storm, will increase its stats- quite a step up from the ever popular "gluttony" and "sturdy".
The ability This allows ditto to not only copy them without having to waste time, but makes him able to copy stat boosts- meaning that a pokemon that just used bellydrum could be switched in on, and henceforth the bonus would be 'stolen' and the ditto would sweep the team. Lead ditto like this could be interesting, as well as dittos with a certain choice scarf.