What do I need to do to script the following condition/effect:

If all card zones are disabled by "xxx" effect and your opponent has no cards in their Hand, Deck, Field, Graveyard and Banish Zone.

When this card is Special Summoned: This cards ATK and DEF are equal to the ATK and DEF of the Xyz Materials required to Special Summon this card.

Edo9300;143497]

What do I need to do to script the following condition/effect:

If all card zones are disabled by "xxx" effect and your opponent has no cards in their Hand, Deck, Field, Graveyard and Banish Zone.

When this card is Special Summoned: This cards ATK and DEF are equal to the ATK and DEF of the Xyz Materials required to Special Summon this card.

this is the atk function

--atkset
local e1=Effect.CreateEffect(c)
e1:SetCategory(CATEGORY_ATKCHANGE)
e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
e1:SetCode(EVENT_SPSUMMON_SUCCESS)
e1:SetOperation(c60000308.op)
c:RegisterEffect(e1)
end
function c60000308.op(e,tp,eg,ep,ev,re,r,rp)
local c=e:GetHandler()
local e1=Effect.CreateEffect(c)
e1:SetType(EFFECT_TYPE_SINGLE)
e1:SetCode(EFFECT_SET_BASE_ATTACK)
e1:SetValue(c:GetOverlayGroup():GetSum(Card.GetAttack))
e1:SetReset(RESET_EVENT+0x1ff0000)
c:RegisterEffect(e1)
end

the first i think is impossible to do as you wrote it, the only thing that can be done is check if the field is all unusable. But a question, how can you opponent have no cards everywhere?

So an all pendulum deck and all pendulum monsters are in the extra deck, that's oddly specific and likely never going to be a condition anyone can fulfill. Unless you meant OR, not AND, which would make more sense.