All feel welcome at the AD shaco guide and this is how i build shaco.
He is nice in late games and in a counter jungle at the enemy.

Insteed of lich bane you could take trinity force, with the slows, cs and ms it would be a nice item ( only when you have a nice feed ).
Instead of Hextech Gunblade you could take Zeke's Herald for the aura and cooldown reduction it would be a nice item.

I choose this runes because you need the cooldown reduction for your deceive, and your hallucinate. Dodging is nice for shaco because your dodge may help you survive your enemies. And momevent speed is just nice for shaco.

You may start with jack in the box when you counter jungle so the choice is on you for the beginning skill.

Good summoner spells:
- Flash is a nice one for shaco so your enemies will be confused which way you gone while you flased back.
- Ghost can be nice for chasing an enemy and be quick away.
- Exhaust so your enemy can't deal any damage to you while you crit tons of damage.
- Ignite when you are bad with your clone under the tower you can choose ignite.
- Clearvoyance nice if you want to backdoor or counter jungle so you have the vision.
- Smite i don't have to explain that

Less good summoner spells:
- Clarity you can choose it but i don't recommend it because of the late game. You may also take the blue buff.

Pros:
- Crit much damage while no enemy can even deal damage.
- Because of lich bane you may get that bit ability power you need in fights.
- Awesome 1v1 fights
- When you have all you can solo baron
- Lich bane Unique passive adds damage to deceive

Cons:
- Jack in the box don't deal much damage.
- You have to be careful without lifesteal at the beginning

I gonna end this guide i hope it will help improve the ad shaco and i hope i'll see you soon in the Field of Justice. Feel free to comment