Hello, this is my Jungle Ekko build for you to easily climb to your dream rank. My peak rank is Masters and I feel like I can get much higher this season.
I stream on Twitch so feel free to stop by and ask any unanswered questions :)

Pros → Massive burst damage → Tons of mobility with passive and E/R → Parallel Convergence supplies insane CC → S11 AP Junglers are fun to play and allows for mid/top/adc to go AD → If timed correctly one you can steal dragons and barons with ease. → Literally teleports back in time...

Cons → Slow early game clear → Crowd control is your worst enemy → Ignite and heal reduction sucks the healing out of your ultimate → Susceptible to invades

DOMINATION

Dark Harvest is an incredible keystone for burst and scaling. This allows Ekko to farm stacks and scale into the late game becoming a one-shot machine. Additionally, when you kill someone it resets the cooldown on Dark Harvest allowing for huge damage during teamfights.

Next you would take Sudden Impact. This is because Phase Dive is usually the first ability Ekko uses to engage. With Sudden Impact it allows you to deal even more damage with its magic penetration. Sudden Impact is more reliable than Cheap Shot since you don't need to land cc to enable it.

You have the choice of going Zombie Ward or Eyeball Collection. I would recommend Eyeball Collection because most players have trouble stacking this due to either a low amount of wards on the enemy team or lack of vision sweeping. So instead of wasting a rune you can just go Eyeball Collection and don't have to worry about stacking.

Here are pretty standard runes for AP Junglers to take. Ekko relies a lot on attack speed for Z-Drive Resonance and the passive on Parallel Convergence. Also taking armor is a must for junglers.

	SUMMONER SPELLS - FLASH: Flash is a must since it gives Ekko another gap closer. This is incredibly useful for surprise stuns with your Parallel Convergence. There isn't much diversity for other choices, however, you are free to test out taking ignote or Ghost if you feel like limit testing. SMITE: Take Smite ...

PASSIVE ABILITY

Z-Drive Resonance Makes you go zoom. AA,Q,E,R applies stacks, after 3 stacks it deal additional damage and gives you movement speed. Useful in chasing or escaping.

Q

Timewinder Flings out sphere thing that slows after a certain distance. Best tip I can give when using this skill is to hold onto it until you are sure it will hit. This is your only CC other than Parallel Convergence so you must hit it to ensure you get the kill.

W

Parallel Convergence Insane skill. AEO ability that stuns for 2.25 seconds at level 1. Game changing ability during team fights and incredibly useful for ganks and outplays.

E

Phase Dive One of the best gap closers in the game. Allows you dash over many walls (if this guide gets 5000 likes I may make a video on all the walls Ekko can E over). Pro tip! The second part of Phase Dive is a blink so when you auto someone you can go over small skill shots such as Ahri's Charm.

R

Chronobreak Infinite outplay potential on this ultimate. Allows Ekko to go back in time while teleporting and healing then making an explosion on the after-images' position.

Hextech Rocketbelt

Lich Bane

Mercury's Treads

Morellonomicon

Must have is Hextech Rocketbelt. Gives you another gap closer and extra movement speed when used. If you want to one-shot your enemies Lich Bane is going to allow that to happen. This in combination with Phase Dive will deplete the enemies health bar instantly. Also gives movement speed which is nice. Mercury's Treads is another option you can pick if there is a lot of crowd control. This gives you more survivability since you won't be CC chained to death without using your Zhonya's Hourglass or Chronobreak. Finally, if the enemy team has a bunch of healing such as Goredrinker or Sylas then Morellonomicon is a must. You don't even have to complete this item. Invest 800g for Oblivion Orb and their healing will be less of a problem.

Early ward
Decide pathing
Focus on farming for first item

Rush Hextech Rocketbelt
Parallel Convergence positioning during fights is crucial. Putting it on the enemies escape path, or using it to peel.

** Will update in the future. Got to do homework now T.T **