Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card is Normal/Special Summoned, or flipped face-up: You can target up to 2 face-up monsters on the field; change them to face-down Defense Position, and if you do, any opponent's monsters that were flipped by this effect cannot change their battle positions. If a monster on the field is flipped face-up, while this monster is face-up on the field (except during the Damage Step): You can target 1 card your opponent controls; destroy it. You can only use each effect of "Jioh the Gravity Ninja" once per turn.
--重の忍者－磁翁
--Jioh the Gravity Ninja
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--Flip up to 2 monsters face-down
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_POSITION)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_SUMMON_SUCCESS)
	e1:SetCountLimit(1,id)
	e1:SetTarget(s.postg)
	e1:SetOperation(s.posop)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EVENT_FLIP)
	c:RegisterEffect(e3)
	--Destroy 1 monster
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,4))
	e4:SetCategory(CATEGORY_DESTROY)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e4:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET,EFFECT_FLAG2_CHECK_SIMULTANEOUS)
	e4:SetCode(EVENT_FLIP)
	e4:SetRange(LOCATION_MZONE)
	e4:SetCountLimit(1,{id,1})
	e4:SetCondition(s.descon)
	e4:SetTarget(s.destg)
	e4:SetOperation(s.desop)
	c:RegisterEffect(e4)
end
function s.postg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsCanTurnSet() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsCanTurnSet,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,Card.IsCanTurnSet,tp,LOCATION_MZONE,LOCATION_MZONE,1,2,nil)
	Duel.SetOperationInfo(0,CATEGORY_POSITION,g,#g,0,0)
end
function s.posop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetTargetCards(e)
	if #g==0 or Duel.ChangePosition(g,POS_FACEDOWN_DEFENSE)==0 then return end
	local c=e:GetHandler()
	g:Match(Card.IsControler,nil,1-tp)
	for tc in g:Match(Card.IsPosition,nil,POS_FACEDOWN_DEFENSE):Iter() do
		--Cannot change its battle position
		local e1=Effect.CreateEffect(c)
		e1:SetDescription(3313)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetProperty(EFFECT_FLAG_CLIENT_HINT)
		e1:SetCode(EFFECT_CANNOT_CHANGE_POSITION)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD)
		tc:RegisterEffect(e1)
	end
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return not eg:IsContains(e:GetHandler())
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(1-tp) and chkc:IsOnField() end
	if chk==0 then return Duel.IsExistingTarget(nil,tp,0,LOCATION_ONFIELD,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,nil,tp,0,LOCATION_ONFIELD,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Destroy(tc,REASON_EFFECT)
	end
end