Question

1. say my serpirior had the abbility Contrary and used coil would it decrease those things or stay the same
2. does contary stay for one turn like lets say serpirior used leaf storm it raises special attack next turn leaf storm lowers again

please help thank you

Answer 1

Nope, the Contrary boosts are permanent until you switch out or are hazed. Also, yes, Coil would lower your stats, as would any other stat boosting move.