Ok. So i want to train my Shedinja for attack.

But how do i know how much times i need to do it?

And lets say i do it as much as i need. But my shedinja is only lv 50. what do i do then?

Help please >.<

Can someone answer the question? I've already been to the site, But it never told me what to do after you have reached your max EV's and your pokemon at at level 50 or something.