Skarner is a very strong jungler with many build. this is an attack speed based AD jungle build.
There are a few risks to this build. you can only gank with a 100% chance to get a kill/assist. u must farm your stacks or you will be worthless. invaid if you think you can it will get your stacks up faster. Ask your team to play passively so that you can stay in the jungle as much as possible to farm your stacks. if you don't have your FF by 20 min then you and your team need to hard farm till late game or your doomed to fail. your team will complain that you wont be giving them buffs and don't its better you get a stack than them get a buff every stack counts. its best to use this build with ppl you know that way it will be ezer to explain but its also very strong in solo. aside from these its a very strong build and can 1v1 90% of champs i have only failed once on a pure ad panth GL and have fun.