How to counter Lillia
Let us take a look on how to beat Lillia. We will look at champions who are strong against Lillia and who are weak against Lillia. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Jungle champion who counters Lillia. You can already win in champion select with the right counters for Lillia. If you want to know how to counter Lillia then you need to take into account the best picks vs Lillia and the worst picks vs Lillia. This Lillia counter data is based on matches played by Pros on patch 13.24 and previous ones. It is important to see whether Pros counter picked Lillia or whether they played as Lillia.
Champions used by Pros to counter pick Lillia
Looking at the matches from Pros (see table Pros counter picked Lillia) we can see that they picked 
Lee Sin most often to counter pick Lillia. The matchup Lee Sin vs Lillia occured 20 times. Lillia has 12 wins and 8 losses in this matchup. Learn how to counter pick Lee Sin to get another perspective on the data.
Lane outcome for Lillia
When looking at Lillia 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 Lillia. The lane outcome of Lillia consists of three outcomes: Win, Loss or Draw. Let's take a look of Lillia 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 Lillia.
Conclusion
Analyze the available data and learn how to beat Lillia. To master Lillia take also a look on Lillia builds and runes for Lillia. Good luck, Summoner!