Shaco Runes explained
There's one set of runes for Shaco on patch
11.19
that is the clear favorite for LoL players and pros alike. The best Shaco Runes on the position 
Jungle are Domination as the primary path and
Precision as the secondary path with a pick rate of 71%. Besides runes you should take a look on Shaco Build and if you are interested in pro matches take a look at Shaco Probuilds. If you want to discuss
Shaco then you should visit the champion subreddit.
Primary path on Shaco
Domination improves burst damage and assassination tools on Shaco. Most of high elo players – and our LoL pros in the the major regions – have agreed that
Dark Harvest is the best keystone rune to run on
Shaco. This keystone rune gives you additional damage throughout the match. This is usually followed up by taking
Sudden Impact,
Eyeball Collection and
Ingenious Hunter.
Sudden Impact increases your damage after dashing or being invisible. This is due to how easy it is to activate on Shaco with the amount of ways he has to dash, jump or going invisible. The additional lethality helps to take down the priority targets that much easier.
Eyeball Collection is next up. This grants the user additional damage with every killing they score.
Ingenious Hunter gives you item haste on every unique champion takedown.
Secondary path on Shaco
When it comes to your secondary path, most
Shaco players prefer to go with
Precision.
Precision improves attack and sustained damage on Shaco troughout the match. On the
Precision path, the best runes for Shaco are
Legend: Alacrity and
Coup de Grace.
Legend: Alacrity grants additional attack speed to Shaco. Shaco deals with
Coup de Grace more damage to targets with low health.