Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
[ Pendulum Effect ] Once per turn, at the start of the Damage Step, when your "Performapal" monster battles an opponent's face-up monster: You can make that opponent's monster lose 600 ATK (even if this card leaves the field). ---------------------------------------- [ Monster Effect ] If your "Performapal" monster attacked, after damage calculation: You can target 1 face-up monster your opponent controls; that target loses ATK equal to the ATK of that "Performapal" monster.
--EMバラード
--Performapal Ballad
local s,id=GetID()
function s.initial_effect(c)
	--pendulum summon
	Pendulum.AddProcedure(c)
	--atk
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_BATTLE_START)
	e1:SetRange(LOCATION_PZONE)
	e1:SetCountLimit(1)
	e1:SetCondition(s.atkcon1)
	e1:SetOperation(s.atkop1)
	c:RegisterEffect(e1)
	--atk
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BATTLED)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCondition(s.atkcon2)
	e2:SetTarget(s.atktg2)
	e2:SetOperation(s.atkop2)
	c:RegisterEffect(e2)
end
s.listed_series={SET_PERFORMAPAL}
function s.atkcon1(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetAttacker()
	local bc=Duel.GetAttackTarget()
	if not bc then return false end
	if tc:IsControler(1-tp) then bc,tc=tc,bc end
	e:SetLabelObject(bc)
	return bc:IsFaceup() and tc:IsFaceup() and tc:IsSetCard(SET_PERFORMAPAL)
end
function s.atkop1(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local bc=e:GetLabelObject()
	if bc:IsRelateToBattle() and bc:IsFaceup() and bc:IsControler(1-tp) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-600)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		bc:RegisterEffect(e1)
	end
end
function s.atkcon2(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	return a:IsControler(tp) and a:IsSetCard(SET_PERFORMAPAL)
end
function s.atktg2(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1-tp) and chkc:IsFaceup() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATKDEF)
	Duel.SelectTarget(tp,Card.IsFaceup,tp,0,LOCATION_MZONE,1,1,nil)
end
function s.atkop2(e,tp,eg,ep,ev,re,r,rp)
	local a=Duel.GetAttacker()
	local tc=Duel.GetFirstTarget()
	if a:IsFaceup() and tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local atk=math.max(0,a:GetAttack())
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-atk)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
	end
end