namespace Gen7 {
    [Ability effect=Berserk]
    class Berserk : PkmnScript {
        void OnDamage(Pokemon@ pokemon, DamageSource, uint old, uint new) override {
            if (float(old) / pokemon.MaxHealth >= 0.5f && float(new) / pokemon.MaxHealth < 0.5f) {
                pokemon.ChangeStatBoost(Statistic::SpecialDefense, 1, true);
            }
        }
    }
}