Rally Heart (Love Cry in the Japanese version) is a Skill from Fire Emblem: Awakening. It increases all stats by 2 and movement by 1 to all allies within a 3 tile radius for one turn when the Rally command is used. This skill is learned by Brides at level 1.
As with all skills obtained through downloadable content, this cannot be passed on to any children characters from the parents. However, if the character is eligible to change into that class they can obtain the skill anyway.