As I told you,this build is about a shaco being viable assasin for team and not just assasin with boxes.You NEED magic penetration,it works for lichbane which does magic damage.Also lichbane gives some magic resist,movement speed and you do incredible damage with it since you can reach over 600 abillity power which means you do it in damage with it.I dont see a reason to dont use lichbane.

im confused on why you have a lich bane, i play ap shaco all the time and never have i once used it. your build is fragile and has too much mpen. your advice isnt very good and any person reading this trying to learn about shaco prolly wont be able to do good.