Flash
If your opponent controls monsters in all of their Main Monster Zones: Destroy all monsters your opponent controls.
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter(c)
	return c:GetSequence() < 5
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return Duel.GetMatchingGroupCount(s.cfilter, tp, 0, LOCATION_MZONE, nil) >= 5
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(aux.TRUE, tp, 0, LOCATION_MZONE, 1, nil)
	end
	local sg = Duel.GetMatchingGroup(aux.TRUE, tp, 0, LOCATION_MZONE, nil)
	Duel.SetOperationInfo(0, CATEGORY_DESTROY, sg, sg:GetCount(), 0, 0)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local sg = Duel.GetMatchingGroup(aux.TRUE, tp, 0, LOCATION_MZONE, nil)
	Duel.Destroy(sg, REASON_EFFECT)
end


Flash
If your opponent controls monsters in all of their Main Monster Zones: Destroy all monsters your opponent controls.
-- Flash
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.cfilter(c)
	return c:GetSequence() < 5
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return Duel.GetMatchingGroupCount(s.cfilter, tp, 0, LOCATION_MZONE, nil) >= 5
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(aux.TRUE, tp, 0, LOCATION_MZONE, 1, nil)
	end
	local sg = Duel.GetMatchingGroup(aux.TRUE, tp, 0, LOCATION_MZONE, nil)
	Duel.SetOperationInfo(0, CATEGORY_DESTROY, sg, sg:GetCount(), 0, 0)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local sg = Duel.GetMatchingGroup(aux.TRUE, tp, 0, LOCATION_MZONE, nil)
	Duel.Destroy(sg, REASON_EFFECT)
end

