Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When this card is activated: You can add 1 "Penguin" card from your Deck to your hand, except "Royal Penguins Garden". Once per turn, during your Main Phase: You can decrease the Level of 1 "Penguin" monster in your hand or face-up field by 1 (until the end of this turn), then discard 1 card. You can only activate 1 "Royal Penguins Garden" per turn.
--ロイヤル・ペンギンズ・ガーデン
--Royal Penguins Garden
--Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	--Reduce level then discard
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_LVCHANGE+CATEGORY_HANDES)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1)
	e2:SetTarget(s.lvtg)
	e2:SetOperation(s.lvop)
	c:RegisterEffect(e2)
end
s.listed_series={SET_PENGUIN}
function s.thfilter(c)
	return c:IsSetCard(SET_PENGUIN) and not c:IsCode(id) and c:IsAbleToHand()
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.thfilter,tp,LOCATION_DECK,0,nil)
	if #g>0 and Duel.SelectYesNo(tp,aux.Stringid(id,0)) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
		local sg=g:Select(tp,1,1,nil)
		Duel.SendtoHand(sg,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,sg)
	end
end
function s.lvfilter(c)
	return c:IsSetCard(SET_PENGUIN) and c:IsLevelAbove(2) and (c:IsFaceup() or c:IsLocation(LOCATION_HAND))
end
function s.lvtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then
		return Duel.IsExistingMatchingCard(s.lvfilter,tp,LOCATION_HAND|LOCATION_MZONE,0,1,nil)
			and Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil,REASON_EFFECT|REASON_DISCARD)
	end
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,tp,1)
end
function s.lvop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,aux.Stringid(id,2))
	local g=Duel.SelectMatchingCard(tp,s.lvfilter,tp,LOCATION_HAND|LOCATION_MZONE,0,1,1,nil)
	if #g>0 then
		local tc=g:GetFirst()
		if tc:IsLocation(LOCATION_MZONE) then
			Duel.HintSelection(g)
		else
			Duel.ConfirmCards(1-tp,g)
			Duel.ShuffleHand(tp)
		end
		--Reduce level
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_LEVEL)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD&~RESET_TOFIELD)|RESET_PHASE|PHASE_END)
		e1:SetValue(-1)
		tc:RegisterEffect(e1)
		if Duel.IsExistingMatchingCard(Card.IsDiscardable,tp,LOCATION_HAND,0,1,nil,REASON_EFFECT|REASON_DISCARD) then
			Duel.BreakEffect()
			Duel.DiscardHand(tp,Card.IsDiscardable,1,1,REASON_EFFECT|REASON_DISCARD)
		end
	end
end