Gen7Data/Scripts/Moves/Struggle.as

namespace Gen7 {
    [Move effect=Struggle]
    shared class Struggle : PkmnScript {
        void OnSecondaryEffect(ExecutingMove@ attack, Pokemon@ target, uint8 hit) override{
            attack.User.Damage(uint(attack.User.MaxHealth / 4), DamageSource::Struggle);
        }
    }
}