Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card is activated: You can target 1 Level 4 or lower Dragon monster in your GY; add it to your hand or Special Summon it. Once per turn: You can target 1 Dragon monster you control; move that monster you control to another of your Main Monster Zones. You can only activate 1 "World Legacy Guardragon" per turn.
--星遺物の守護竜
--World Legacy Guardragon
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	--Move to another MMZ
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1)
	e2:SetTarget(s.mvtg)
	e2:SetOperation(s.mvop)
	c:RegisterEffect(e2)
end
function s.filter(c,e,tp,lc)
	return c:IsRace(RACE_DRAGON) and c:IsLevelBelow(4)
		and (c:IsAbleToHand() or (lc>0 and c:IsCanBeSpecialSummoned(e,0,tp,false,false)))
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	local lc=Duel.GetLocationCount(tp,LOCATION_MZONE)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.filter(chkc,e,tp,lc) end
	if chk==0 then return true end
	if Duel.IsExistingTarget(s.filter,tp,LOCATION_GRAVE,0,1,nil,e,tp,lc) and Duel.SelectYesNo(tp,aux.Stringid(id,0)) then
		e:SetCategory(CATEGORY_TOHAND+CATEGORY_SPECIAL_SUMMON)
		e:SetProperty(EFFECT_FLAG_CARD_TARGET)
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
		local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp,lc)
		Duel.SetOperationInfo(0,CATEGORY_LEAVE_GRAVE,g,1,tp,0)
		Duel.SetPossibleOperationInfo(0,CATEGORY_TOHAND,g,1,tp,LOCATION_GRAVE)
		Duel.SetPossibleOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,tp,LOCATION_GRAVE)
	else
		e:SetCategory(0)
		e:SetProperty(0)
	end
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if not (tc and tc:IsRelateToEffect(e)) then return end
	aux.ToHandOrElse(tc,tp,
		function()
			return Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and tc:IsCanBeSpecialSummoned(e,0,tp,false,false)
		end,
		function() Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP) end,
		aux.Stringid(id,2)
	)
end
function s.mvtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and chkc:IsFaceup() and chkc:IsRace(RACE_DRAGON) end
	if chk==0 then return Duel.IsExistingTarget(aux.FaceupFilter(Card.IsRace,RACE_DRAGON),tp,LOCATION_MZONE,0,1,nil)
		and Duel.GetLocationCount(tp,LOCATION_MZONE,tp,LOCATION_REASON_CONTROL)>0 end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	Duel.SelectTarget(tp,aux.FaceupFilter(Card.IsRace,RACE_DRAGON),tp,LOCATION_MZONE,0,1,1,nil)
end
function s.mvop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if not tc:IsRelateToEffect(e) or tc:IsImmuneToEffect(e) or tc:IsControler(1-tp)
		or Duel.GetLocationCount(tp,LOCATION_MZONE,tp,LOCATION_REASON_CONTROL)==0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOZONE)
	local s=Duel.SelectDisableField(tp,1,LOCATION_MZONE,0,0)
	local nseq=math.log(s,2)
	Duel.MoveSequence(tc,nseq)
end