Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, when the battle position of an opponent's monster(s) is changed (except during the Damage Step): You can target one of those monsters; it loses 1000 ATK and DEF.
--幻蝶の刺客モルフォ
--Morpho Butterspy
local s,id=GetID()
function s.initial_effect(c)
	--atk,def
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_ATKCHANGE+CATEGORY_DEFCHANGE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_TRIGGER_O+EFFECT_TYPE_FIELD)
	e1:SetCode(EVENT_CHANGE_POS)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetTarget(s.adtg)
	e1:SetOperation(s.adop)
	c:RegisterEffect(e1)
end
function s.cfilter(c,e,tp)
	local np=c:GetPosition()
	local pp=c:GetPreviousPosition()
	return c:IsControler(tp) and c:IsCanBeEffectTarget(e)
		and ((pp==POS_FACEUP_ATTACK and np==POS_FACEUP_DEFENSE) or (pp==POS_FACEUP_DEFENSE and np==POS_FACEUP_ATTACK) or (pp==POS_FACEDOWN_DEFENSE and np==POS_FACEUP_ATTACK))
end
function s.adtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return eg:IsContains(chkc) and s.cfilter(chkc,e,1-tp) end
	if chk==0 then return eg:IsExists(s.cfilter,1,nil,e,1-tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	local g=eg:FilterSelect(tp,s.cfilter,1,1,nil,e,1-tp)
	Duel.SetTargetCard(g)
end
function s.adop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-1000)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_UPDATE_DEFENSE)
		tc:RegisterEffect(e2)
	end
end