How to counter Lulu
Let us take a look on how to beat Lulu. We will look at champions who are strong against Lulu and who are weak against Lulu. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Support champion who counters Lulu. You can already win in champion select with the right counters for Lulu. If you want to know how to counter Lulu then you need to take into account the best picks vs Lulu and the worst picks vs Lulu. This Lulu 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 Lulu or whether they played as Lulu.
Champions used by Pros to counter pick Lulu
Looking at the matches from Pros (see table Pros counter picked Lulu) we can see that they picked 
Rakan most often to counter pick Lulu. The matchup Rakan vs Lulu occured 30 times. Lulu has 17 wins and 13 losses in this matchup. Learn how to counter pick Rakan to get another perspective on the data.
Lane outcome for Lulu
When looking at Lulu 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 Lulu. The lane outcome of Lulu consists of three outcomes: Win, Loss or Draw. Let's take a look of Lulu 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 Lulu.
Conclusion
Analyze the available data and learn how to beat Lulu. To master Lulu take also a look on Lulu builds and runes for Lulu. Good luck, Summoner!