Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
"Junk Synchron" + 1 or more non-Tuner monsters You can banish 1 "Junk" monster from your Graveyard, then target 1 face-up monster your opponent controls; that target loses ATK equal to the banished monster's ATK. At the start of the Damage Step, if this card attacks a Defense Position monster: Destroy that monster.
--ジャンク・バーサーカー
--Junk Berserker
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--Synchro Summon procedure: "Junk Synchron" + 1+ non-Tuner monsters
	Synchro.AddProcedure(c,s.tunerfilter,1,1,Synchro.NonTuner(nil),1,99)
	--Make 1 face-up monster your opponent controls lose ATK equal to the ATK of the "Junk" monster banished to activate this effect
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCost(s.atkcost)
	e1:SetTarget(s.atktg)
	e1:SetOperation(s.atkop)
	c:RegisterEffect(e1)
	--Destroy a Defense Position monster that this card attacks
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_BATTLE_START)
	e2:SetCondition(s.descon)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
s.material={CARD_JUNK_SYNCHRON}
s.listed_names={CARD_JUNK_SYNCHRON}
s.material_setcode=SET_SYNCHRON
s.listed_series={SET_JUNK}
function s.tunerfilter(c,lc,stype,tp)
	return c:IsSummonCode(lc,stype,tp,CARD_JUNK_SYNCHRON) or c:IsHasEffect(20932152)
end
function s.atkcostfilter(c)
	return c:IsSetCard(SET_JUNK) and c:IsMonster() and c:GetAttack()>0 and c:IsAbleToRemoveAsCost()
		and aux.SpElimFilter(c,true)
end
function s.atkcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.atkcostfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local sc=Duel.SelectMatchingCard(tp,s.atkcostfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,1,nil):GetFirst()
	e:SetLabel(sc:GetAttack())
	Duel.Remove(sc,POS_FACEUP,REASON_COST)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(1-tp) and chkc:IsLocation(LOCATION_MZONE) 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.atkop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsFaceup() and tc:IsControler(1-tp) then
		--That target loses ATK equal to the banished monster's ATK
		tc:UpdateAttack(-e:GetLabel(),nil,e:GetHandler())
	end
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	local bc=Duel.GetAttackTarget()
	return e:GetHandler()==Duel.GetAttacker() and bc and bc:IsDefensePos()
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,Duel.GetAttackTarget(),1,tp,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local bc=Duel.GetAttackTarget()
	if bc and bc:IsRelateToBattle() then
		Duel.Destroy(bc,REASON_EFFECT)
	end
end