Garen has good jungle clear at lv5 since he can spin to kill small monsters.

+Pros:
*Good jungle clear mid-late game
*Good late
*Can counter jungle such as kha'zix and much more thanks to his silence
+Cons:
*No gap closer
*Expensive build
*Quite squishy early
*Team mate might angry and afk

Flash can be replaced with ghost if u want to. However, flash has more early potential ganks

Late game u should sell the jungle item and choose a defensive item