Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
[ Pendulum Effect ] All "Performapal" monsters you control gain 300 ATK. ---------------------------------------- [ Monster Effect ] When this card declares an attack: All "Performapal" monsters you currently control gain 300 ATK, until the end of the Battle Phase.
--EMシルバー・クロウ
--Performapal Silver Claw
local s,id=GetID()
function s.initial_effect(c)
	--pendulum summon
	Pendulum.AddProcedure(c)
	--atk
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_PZONE)
	e2:SetTargetRange(LOCATION_MZONE,0)
	e2:SetTarget(s.atktg)
	e2:SetValue(300)
	c:RegisterEffect(e2)
	--atk
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,0))
	e3:SetCategory(CATEGORY_ATKCHANGE)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e3:SetCode(EVENT_ATTACK_ANNOUNCE)
	e3:SetTarget(s.target)
	e3:SetOperation(s.operation)
	c:RegisterEffect(e3)
end
s.listed_series={SET_PERFORMAPAL}
function s.atktg(e,c)
	return c:IsSetCard(SET_PERFORMAPAL)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsSetCard,SET_PERFORMAPAL),tp,LOCATION_MZONE,0,1,nil) end
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(aux.FaceupFilter(Card.IsSetCard,SET_PERFORMAPAL),tp,LOCATION_MZONE,0,nil)
	local tc=g:GetFirst()
	for tc in aux.Next(g) do
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(300)
		e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
		e1:SetReset(RESET_EVENT|RESETS_STANDARD|RESET_PHASE|PHASE_BATTLE)
		tc:RegisterEffect(e1)
	end
end