I want to say that Zen Mode ability sucks and he should start transformed. But then I remember that:
>Darumaka has 90 base attack and Hustle
>Learns Fire Punch so early that in the wild they are already using it
>Darmanitan has 140 base attack AND Sheer Force
>Base 95 speed which is above average for Gen 5 standards
Maybe they just noticed midway too much firepower in a random mon