Does is get affected and do the opposite of Trick Room actually does and still go first?
contrary reverses stat changes so no it is not effected by T-room Serperior would still go last and shuckle first
Basically, Contray will effect stat changes only, and because Trick Room doesn't count as stat change because there isn't any change in stat (only a change in stat meaning itself) a Munchlax will still out-speed Serperior in T-Room.