Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
[ Pendulum Effect ] Once per turn, during your Main Phase 1: You can target 1 face-up monster you control; the monsters your opponent currently controls lose 800 DEF until the end of this turn, and if they do, if the targeted monster attacks a Defense Position monster this turn, inflict piercing battle damage to your opponent. (These effects remain even if this card leaves the field.) ---------------------------------------- [ Monster Effect ] If this card is destroyed by battle: You can make the monster that destroyed this card lose 800 ATK.
--ＥＭラクダウン
--Performapal Camelump
local s,id=GetID()
function s.initial_effect(c)
	--Enable pendulum summon
	Pendulum.AddProcedure(c)
	--All your opponent's monsters loses 800 DEF, 1 of your monsters inflicts piercing damage
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_PZONE)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCountLimit(1)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
	--If destroyed by battle, the monster that destroyed it loses 800 ATK
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_ATKCHANGE)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetCode(EVENT_BATTLE_DESTROYED)
	e3:SetProperty(EFFECT_FLAG_DELAY)
	e3:SetCondition(s.atkcon)
	e3:SetOperation(s.atkop)
	c:RegisterEffect(e3)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsAbleToEnterBP()
end
function s.filter(c)
	return c:IsFaceup() and not c:IsHasEffect(EFFECT_PIERCE)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,0,1,nil)
		and Duel.IsExistingMatchingCard(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,0,1,1,nil)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local tc=Duel.GetFirstTarget()
	local g=Duel.GetMatchingGroup(Card.IsFaceup,tp,0,LOCATION_MZONE,nil)
	if #g==0 then return end
	local gc=g:GetFirst()
	for gc in aux.Next(g) do
		--Loses 800 DEF
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_DEFENSE)
		e1:SetValue(-800)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		gc:RegisterEffect(e1)
	end
	if tc:IsRelateToEffect(e) then
		--Inflict piercing damage
		local e2=Effect.CreateEffect(e:GetHandler())
		e2:SetDescription(3208)
		e2:SetProperty(EFFECT_FLAG_CLIENT_HINT)
		e2:SetType(EFFECT_TYPE_SINGLE)
		e2:SetCode(EFFECT_PIERCE)
		e2:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e2)
	end
end
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	local rc=e:GetHandler():GetReasonCard()
	return rc:IsRelateToBattle()
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local rc=e:GetHandler():GetReasonCard()
	if rc:IsRelateToBattle() then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-800)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		rc:RegisterEffect(e1)
	end
end