Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card battles a monster in the Extra Monster Zone, it gains 800 ATK and DEF during the Damage Step only.
--Re:EX
--Re: EX
local s,id=GetID()
function s.initial_effect(c)
	--increase atk/def
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetCondition(s.condition)
	e1:SetValue(800)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e1)
end
function s.condition(e)
	local c=e:GetHandler()
	local ph=Duel.GetCurrentPhase()
	local bc=c:GetBattleTarget()
	return (ph==PHASE_DAMAGE or ph==PHASE_DAMAGE_CAL)
		and c:IsRelateToBattle() and bc and bc:GetSequence()>=5
end