Backstab (Innate): Shaco deals 20% bonus damage when striking a unit from behind with his autoattacks or abilities.

Ability Description Leveling up

Deceive (Active):
Shaco instantly blinks to a target nearby location and enters stealth for up to 3.5 seconds. His next autoattack while stealthed will critically strike dealing bonus damage and will end his stealth. This is a special critical strike and will stack additively with the bonus damage from a normal critical strike.
Cooldown: 11 seconds after stealth fades
eiveRange: 500
Cost: 90 / 80 / 70 / 60 / 50 mana
Bonus Damage: 40 / 60 / 80 / 100 / 120 % of attack damage.


Jack In The Box
(Active): Shaco creates a Jack in the Box at the target location with 150 health. It will stealth after 2 seconds and trigger when an enemy comes near, fearing nearby enemies for a few seconds and attacking them. It deals magic damage, and lasts 90 seconds stealthed or 5 seconds while firing. Casting Jack In The Box breaks stealth.
Cooldown: 16 seconds
Range: 425
Trigger Range: 300
Sight Range: 700 (estimate)
Jack in the Box attack speed: 1.6(Attack 9 times in 5 seconds.)
Jack in the Box armor: 50
Jack in the Box magic resist: 100
Cost: 50 / 55 / 60 / 65 / 70 mana
Fear Duration: 0.5 / 0.75 / 1 / 1.25 / 1.5 seconds

Magic Damage: 35 / 50 / 65 / 80 / 95 (+0.2 per ability power)


Two-Shiv Poison (Passive):
Shaco's attacks poison his targets, reducing their movement speed for 2 seconds. It also gives affected minions a chance to miss their attacks.
Slow: 20 / 22.5 / 25 / 27.5 / 30 %
Miss Chance to Minions: 20 / 22.5 / 25 / 27.5 / 30 %

(Active):
Shaco throws a dagger to target enemy dealing magic damage and applying his slowing poison to them for 3 seconds. The passive is deactivated during the cooldown.
Cooldown: 8 seconds
Range: 625
Cost: 50 / 55 / 60 / 65 / 70 mana
Magic Damage: 40 / 80 / 120 / 160 / 200 (+1.0 per ability power) (+0.5 per attack damage)


Hallucinate:
(Active): Shaco stealths for half a second and creates a clone of himself next to him that will last for up 18 seconds. The clone deals 75% of Shaco's damage and receives 50% extra damage. This clone deals 50% damage to towers and inhibitors. At the end of its duration or when dying the clone will explode dealing magic damage to nearby enemies.
Cost: 100 mana
Leash radius: 1125
AoE radius: 250
Cooldown: 100 / 90 / 80 seconds
Magic Damage: 300 / 450 / 600 (+1.0 per ability power)

This is Shaco's history when he came to Lol

Most would say that death isn't funny. It isn't, unless you're Shaco - then it's hysterical. He is Valoran's first fully functioning homicidal comic; he jests until someone dies, and then he laughs. The figure that has come to be known as the Demon Jester is an enigma. No one fully agrees from whence he came, and Shaco never offers any details on his own. A popular belief is that Shaco is not of Runeterra - that he is a thing summoned from a dark and twisted world. Still others believe that he is the demonic manifestation of humanity's dark urges and therefore cannot be reasoned with. The most plausible belief is that Shaco is an assassin for hire, left to his own lunatic devices until his services are needed. Shaco certainly has proven himself to be a cunning individual, evading authorities at every turn who might seek him for questioning for some horrendous, law-breaking atrocity. While such scuttlebutt might reassure the native inhabitants of Valoran, it seems unimaginable that such a malfeasant figure is allowed to remain at large.


Whatever the truth of his history might be, Shaco has joined the League of Legends for reasons only he knows. He is a terrifying figure, typically shunned by both his fellow champions and the media at large. Only the summoners in the Institute of War know why such a creature was allowed into the League, but most Runeterrans suspect it to be a means that allows the power that be to keep an eye on the ever-elusive Shaco. Unsurprisingly, this champion is popular in places where madness can openly reign, such as among the power-hungry summoners of Zaun and Noxus.

Whatever you do, don't tell him you missed the punch line.

Shaco is one of the best junglers and i should say just try my build both on jungling or tank and AD.it's a very plain guide but very reactive.

You can begin jungling in red buff due to the fact that is very simple.The only thing you need to do is take 5 potions and the cloth armor which gives you 18 armor.You should then run into your red buff do first the "W" ability and put as much as possible before time goes to 1:55 where the buff gets out.Then the only thing you need to do is hitting the red buf with the help of your JAck in the box skill and you are ready to jungle easier the rest of the game because of the adds that red buff gives you.Also,your runes can help you because you will have some extra armor from level 1.Trie that thing i told you above and am sure you will be satisfied and have a nice game being easier to you and to your opponents!!!

If you are jungling...then the masteries will have to be a little different and you will have to get smite.I dont like shaco ap jungle because I really prefer to go AD if im jungling...but its your call.
Then you will have to start with armor cloth and 5 potions
and your build can be the same but as I said...I dont like it very much.