Well, hello to my first guide I hope you´ll enjoy it.
Please notice that im German an my English is not perfect

Main Items

Wriggles Lantern A "musthave" for jungeling.It makes the Jungle easier(passive),grants armor and one of the most importent things, life steal.
Another usefull thing is that you can ward with Wriggle´s

So...,Here are some of the most nescessary items for Shaco.Why?
That´s why: Chance to slow (35%)
Passive of (Bonus damage after using a spell---> especially good for
And the other bonuses(health, mana,crit chance etc.)

Really usefull for and every fight.
Phantom Dancer is needed for more crit chance and attack speed. It also grants more movementspeed.
well if the enemy team isnst tanky you should buy . It grants more life steal and very much damage if farmed.

Other good Items

You should buy it if the enemy team is tanky.
If the enemy team is too strong or you just dont want to die buy this item, it´s very usefull.

Deceive

Its the "ganker-skill" number one.Deceive has to be mainskill(except ap shaco)becaus if your ganking a lane you just into them and attack.( Before ganking better ping the focus,otherwise your mates will not notice the gank)
You can use deceive also for juking or catching up with the enemy

Jack in the box

This skill is importent for cc(place in teamfight),escape and especially jungling.You have to set some boxes at the spawn of the blue buff at 0:55 (because they only exist 1 minute)and let them do the job.->>>smite.

---/Jack in the box can be used as ward to\---

Two-Shiv Poison

I use Two-Shiv Poison only for slowing or triggering .

Hallucinate

Hallucinate is Shaco´s ult. Its very useful for 1vs1 because it deals "Tons of Damage"-Phreak.Really in a 1vs1 Hallucinate is very usefull because if you dont have a buff, you can confuse the enemy. In a Teamfight you can deal some bonus damage(with the clone) and you have an additional AoE spell( clone dies).

I noticed, if you play roaming Shaco [permanently ganking(even´if your laning)] or something like that you might get to the point that someone will cross your way.
They usually will attack you because youre a bit squishy.
If this happens you can do some nice combos whch will cause that you will win the fight.
I usualy prefer to set a box under the enemy.Then Deceive him and pop your ult. Usually the enemy should be very low on health ( especially if its an jungler ). If the enemy is running away you can use your E-skill and chase him to the death.

Counter jungling is especially easy for Shaco. After doing your bluebuff. You can go in a bush that often is used for ganking by the enemy-jungler and place circa 5 boxes into the bush.Then you have to wait and the boxes will do the rest

Pros

-good at ganking
-easy jungle
-epic dance
-good skills
-good escape tools

Cons

-needs to be practiced
-you have to engage usually
-hard to ülay when focused

So in This part i just want to tell you the jungle route.
1.Blue buff:-set 3 boxes at 0:55 at the buff spawn
-ask for getting defended(pull is impossible -> boxes are to fast)
-smite big golem
-early gank bot?
2.Wolfcamp:-set a box at wolf camp and when the box is activated use
-use
-Gank mid?
3.Wraths:-place box
-Deceive
-use if necassary
-gank mid?
4.Golems:-place box at the bush at the red buff
-deceive
-smite if necassary(I usually dont do it)
5.Red buff:-place another box
-deceive
-smite
-Gank where ever it is needed

I hope it helped you out. If you have any suggestion how i could improve my build tell me what I could change.
Did I miss any nescassary items?
Or some Tactics?