How to counter Lucian
Let us take a look on how to beat Lucian. We will look at champions who are strong against Lucian and who are weak against Lucian. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Adc champion who counters Lucian. You can already win in champion select with the right counters for Lucian. If you want to know how to counter Lucian then you need to take into account the best picks vs Lucian and the worst picks vs Lucian. This Lucian counter data is based on matches played by Pros on patch 13.19 and previous ones. It is important to see whether Pros counter picked Lucian or whether they played as Lucian.
Champions used by Pros to counter pick Lucian
Looking at the matches from Pros (see table Pros counter picked Lucian) we can see that they picked 
Kai'Sa most often to counter pick Lucian. The matchup Kai'Sa vs Lucian occured 51 times. Lucian has 27 wins and 24 losses in this matchup. Learn how to counter pick Kai'Sa to get another perspective on the data.
Lane outcome for Lucian
When looking at Lucian 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 Lucian. The lane outcome of Lucian consists of three outcomes: Win, Loss or Draw. Let's take a look of Lucian 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 Lucian.
Conclusion
Analyze the available data and learn how to beat Lucian. To master Lucian take also a look on Lucian builds and runes for Lucian. Good luck, Summoner!