I'm starting a new series called Learning The Meta for each patch where I as a Diamond jungle player try to make a gameplay guide video for champions that are S or S+ tier according to some websites.
This Jarvan IV Jungle Gameplay is a pretty good showcase video of his strengths throughout early, mid and late game. I think he might be underrated right now by many players but his winrate at Platinum+ level is 52,75% which is 4th highest.
There are different builds and masteries you can choose from according to your teams needs and enemy teamcomp.
Highest win/play-rate masteries are: Electrocute, Sudden Impact, Eyeball Collection, Relentless Hunter ||| Triumph, Coup de Grace ||| +9% AS, +6 AD, +5 Armor
Highest win/play-rate final build: Blue Warrior, Merc Treads, Black Cleaver, Guardian Angel, Dead Man's Plate, Spirit Visage
Skill order: First 3 levels - E, Q, W ||| Then max first - R, Q, E, W
Lowest winrate against: Nunu, Kayn, Udyr, Rengar, Xin Zhao
Highest winrate against: Karthus, Sejuani, Zac, Amumu, Hecarim
Let me know if you play Jarvan what kind of masteries you pick and builds you do through your games. Next episodes: Malzahar mid and Evelynn jungle.