This is my first guide and it's a special one as Graves is my main for important ranked situations. First i'd like to say that when playing Graves, he's not going to be your every game go to champion. He'll be that champion you play in a tight series situation for freelo. If he is overplayed he gets boring to the point where you begin to tilt and lose. I mainly use him if i'm in my series or when i need a quick 50 LP or so.

Now we all know Graves can jungle... but we also know armour pen Graves is extremely strong. So why use crit?
Pros:
+Power spike after IE
+1000 damage on crits
+Strong mid game
+Godly late game
+Speedy clear
Cons:
-Slightly below average early-mid game
-falls off hard if heavily behind
-can take long to power spike if relatively new to champion.

Jungle Path is basic
Red Side:
-Smite/take golems
-Kite red
-take scuttle
-smite/take blue
-gank

Blue side:
-smite/take gromp
-take blue
-take scuttle
-smite/take red
-gank

In a fight, your job is to shred anybody in range during a teamfight. Another amazing alternative is split pushing. Graves can easily 1v1/2v1 making split pushing pretty good. He has fast wave clear and decent tower damage. With good communication with your team they will fight when the enemy attempts to stop you.