How to counter Milio
Let us take a look on how to beat Milio. We will look at champions who are strong against Milio and who are weak against Milio. Use win rate, gold difference and creep score difference at minute 10 to find the best 
Support champion who counters Milio. You can already win in champion select with the right counters for Milio. If you want to know how to counter Milio then you need to take into account the best picks vs Milio and the worst picks vs Milio. This Milio counter data is based on matches played by Pros on patch 15.14 and previous ones. It is important to see whether Pros counter picked Milio or whether they played as Milio.
Champions used by Pros to counter pick Milio
Looking at the matches from Pros (see table Pros counter picked Milio) we can see that they picked 
Nami most often to counter pick Milio. The matchup Nami vs Milio occured 11 times. Milio has 7 wins and 4 losses in this matchup. Learn how to counter pick Nami to get another perspective on the data.
Lane outcome for Milio
When looking at Milio 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 Milio. The lane outcome of Milio consists of three outcomes: Win, Loss or Draw. Let's take a look of Milio 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 Milio.
Conclusion
Analyze the available data and learn how to beat Milio. To master Milio take also a look on Milio builds and runes for Milio. Good luck, Summoner!