How to counter Skarner
Let us take a look on how to beat Skarner. We will look at champions who are strong against Skarner and who are weak against Skarner. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Jungle champion who counters Skarner. You can already win in champion select with the right counters for Skarner. If you want to know how to counter Skarner then you need to take into account the best picks vs Skarner and the worst picks vs Skarner. This Skarner counter data is based on matches played by Pros on patch 15.11 and previous ones. It is important to see whether Pros counter picked Skarner or whether they played as Skarner.
Champions used by Pros to counter pick Skarner
Looking at the matches from Pros (see table Pros counter picked Skarner) we can see that they picked 
Xin Zhao most often to counter pick Skarner. The matchup Xin Zhao vs Skarner occured 23 times. Skarner has 13 wins and 10 losses in this matchup. Learn how to counter pick Xin Zhao to get another perspective on the data.
Lane outcome for Skarner
When looking at Skarner counters you will notice that win rates alone are not conclusional. Therefore we provide an overview (see table Lane Outcome) where you can see the lane outcome of Pros who played Skarner. The lane outcome of Skarner consists of three outcomes: Win, Loss or Draw. Let's take a look of Skarner lane and match outcome for specific matchups. Considering the lane outcome and the match outcome of a specific matchup, might enable you to find the right counter for Skarner.
Conclusion
Analyze the available data and learn how to beat Skarner. To master Skarner take also a look on Skarner builds and runes for Skarner. Good luck, Summoner!