Oh no. Anyone can pray for the “poor souls.” I SEEM vaguely to recall some prayers in which we ask Mary to pray for them.
Just FYI, a muttered “May the souls of the faithful departed through the mercies of Christ rest in peace,” at the end of grace or of bedtime prayers counts as a prayer for the “poor souls”.
THX THX.
Can you pray to those IN purgatory, to have them pray for someone else in purgatory?