Before I start up my Jarvan Guide for Everyone, If it was wasn't for my learning with Stonewall's Videos, I wouldn't have made this guide even near possible to make, so Big Shoutouts to him for his Mastery and Love for the J4. <3

Jarvan is what I feel or Believe to have Started the whole 'Jungle Meta' War, that he has tried to break enough upon other Junglers. With that said, there had been other Junglers with high Pick Rates throughout the History of the game, that gives Jarvan just the right amounts of Trouble or Jungle Issues, and thus sometimes even making it a Jungle Clear Race and seeing who gets to Gank Top or Bot first. Jarvan and Along the other 3 Junglers have since then been Frivals throughout seasons, for both being pain in the butts against each other, and putting up a good fight. Jarvan is a Safe Pick Jungle/Top Champion who can get out of Sticky Situations with his E + Q Combo, slow down team fight momentum with his W, and Make the Crowd Control Himself with his Ultimate, Especially when he Strikes a Crowd of more then Two for his Allies to slaughter or himself slaughtering at least one of them. Aganist other Jarvans, they tend to play it safe and wait and see who uses the ultimate so that the other Jarvan can gain the extra advantage.

Top Jarvan:
This is Where Jarvan was Suppose to be on, before be was then able to also Jungle. This can make Jarvan an All-round nuisance, to deal with due to how can just farm up so easily and not give as much worries as other Top Laners are for when they think thier going to get Ganked or when Jarvan is Trying to Freeze the Lane. He can do wonders in Top becuase he can Deal out nasty samage and be somewhat protected from all forms of scoures, as well as do fairly well with all Checklists that Top Laner Can do.

Jungle Jarvan: Cinderhulk:
Cinderhulk on Jarvan Forces him to be played more Utility Wise, then just straight up going ham on people, where he needs to use his abilities accordingly so he won't screw up Chances. He becomes an Alpha Meatshield and Especially on Teamfights based on his pure defenses and Gage Included, and his Fat Health bar do not go down so easily without a fight. This is situationally used on Jarvan for his Allies to Communicate with each other as others do the work around Jarvan as a Team to do the damage for him, even if Jarvan can does raw Damage alone.

Jungle Jarvan: Warrior:
Jarvan likes to get Red when he goes Warrior. With that Said, Jarvan is able to Insta-Explode his Abilties upon his enemies for them to blow up by his pure Damage alone with his E + Q + R Combo, or R + E + Q Combo depending on the postions. He can farm up quickly and even make some sharp stings with his AutoAttacks for other Melee Junglers to worry aganist.

Jungle Jarvan: Bloodrazor:
This Build is one of the More Stupidiest yet Enjoyable Builds that Jarvan can have. Allowing him to go ham on people as he gains adventage to even his Movement Speed where he dosen't need to worry as much Jack as other Squishy Junglers suffer from when they use Bloodrazer. Jarvan is Allowed to poke down and Slice up Oppoments one at a time, but otherwise a Situational Build since you're buying you time with your Auto Attacks.

Support Jarvan?:
Now here me out, before you go and kill me. The Reason why I believe Jarvan can do Wonders in Support is just on what he can do based on his Kit, and even Including Golden Ageis. He can Scout, and AoE Slow down Enemies with his Mountain, Solari, Omen and Glory, allowing him to potentially be one of the most frustrating Supports to deal with. Just Remember to not use this build in normals, and see if this legitimately works for you first.

Pros:
+Jarvan is one of the Remaining Jungler who has a Near Perfection of being an All-Round and Power Jungler.
+Learning and Mastering Jarvan is as Easy as it can be for him.
He's Fairly Mobile enough to Muster other whatever Soft CC the Enemy Throws at him.
+He Adores Cooldown for more Mobility.
+Dosen't Suffer as much when he dies.

Cons:
-As much as I love Jarvan, I feel that he isn't the Absolute Greast #1 Jungler to pick, if you're into Ganking.
-Major Con: Brutally Suffers if he loses to Teamfights.

TL;DR: Jarvan will always find a spot in whatever Meta they brush upon Jarvan. Even if nobody plays Jarvan anymore.

Full Info: Jarvan Will always be a safe pick to play in the game as long as Riot dosen't Massivly Break his Legs with his Es and Qs. He is all-roung safe flex pick Champion who does some of his bestest work when he's jungling. He can make powerful Ganks by trapping his foes with his Ultimate, Breeak up Team Fights to gain Adventages, Scout aganist Dragon or Baron, whatever the case may be, Jarvan can do it. The only thing Jarvan can not Offically do, is also becoming a Mid Lane Champion, due to him being counter-Bombarded by Ranged Champions can just kite him out for Days, Espically those with AP or CC, such as LeBlanc or Kassadin.
In Short, Jarvan likes to kick *** and he does so in the Name of Demacia, so Hooray for Jarvan and Hooray for Stonewall. :3 I Highly Recommend you watch Stonewall's Channel as I couldn't do almost any of this work without him. All love and Credits go to him. <3