Giga flex pick ,they wont expect you to go jg .You can easily solo baron/herald without the enemy team knowing and win 1v9 games

Pros
-Flex Pick
-Ad Tank/Bruiser that can kill Tanks,Adc,Mages,Bruisers,Supports,Assasins, do solo objectives
-After tiamat insanely fast clear can get 170 farm in 20 minutes EASILY!
-Many build options
-Comeback potential even if you get punished

Cons
-Slow and unhealthy first clear
-Can get punished
-Ganking is not the best option so your teamates will be tilted if camped

Basically the ultimate goal you have is to get baron and finish the game
To do that it is important to develop an xp/gold advantage compared to the enemy jgler(Right now jg is the most powerful position and jg diff is not just a meme
So this is your plan
-Ban Lee sin or Olaf

-Do full clear+get everything you can from the enemy jg (because your clear is not fast most of the time you wont able to get a scrub but it does not really matter)

-Get tiamat so you can clear camps insanely fast.If your bot lane has prio and you know where the enemy jgler is do solo drake

-Its ok to skip 1 or 2 drakes but when the enemy team does drake you should get herald place it somewhere and get the plate gold ,if u get enough gold you should be able to recal and finish Blade of the ruined king

-If you manage to get 1-2 kills with 170 farm on 20 minutes you will be able to get Blade+Tiamat/hydra+Tank mythic and therefore if you know the enemies dont have vision around baron (so use oracle) just take it, they will be tilted and thing the game has ended.After that just push sidelanes and secure last drakes unless they ff before that and type on /all chat "Imagine losing to Irelia jungle"

Basically to make your clear the least painful you have to use your passive correcly
The most efficient path is :
Blue do 2 aa then Q and kite it towards gromp

E gromp q aa q and kite it towards wolves you can smite it and then Q to get the reset

Use E on all of 3 wolves Q the big 1 and then try to kill the 2 small ones with Q "BE CAREFULL:BY AUTOATTACKING SMALL MONSTERS LIKE SMALL WOLVES/RAPTORS/KRUGS YOU DONT REFRESH YOUR PASSIVE STACK SO IT MAY MESS YOUR CLEAR"

Then go to raptors E behind the big one aa a small one and go towards the bush so all raptors be in a straight line then E on you and W to hit them all and try to kill every raptors with Q to get hp back
Pro tip:If you kited the wolves very well you have enough time to W raptors outside the camp to maintain the stacks you got from wolves
,kill red with smite,
then use E on krugs and jump thru the wall with Q kill the medium one and then you can Q on the small ones to maintain the passive

After you do your full clear you have some options options

1)Scuttle+gank
2)Get enemy gromp/wolves
3)Recall to get vampiric +boots if you feel insecure
4)Go to the crossmap scuttle and then get krugs or gank (my favorite)
After you get tiamat your clear will be so much improved that you will outcs the enemy jgler in no time

Im a gold hardstuck mid main that decided to play jg because ,jg is op and most of the games are lost because my jgler does nothing.I play like 10 games with ire jg and lost 1 because my rakan went afk.I had huge success and i really believe its viable and fun to play.This is the first guide i ever made and ik its trash ,but i will be happy if it managed to help some of you reading
I hope you improve your mmr and not int your games :)
If you have trouble with your clear i may stream some games here https://www.twitch.tv/lazlum71
if its highly demanded.Also like/dislike the guide and post your comments ,wtih your feedback i can improve it
GOOD LUCK ON THE RIFT