Does bitcoin has economic value of that certain country like being acknowledge as part of their asset that can determine the value of their econmy?
Not sure what you mean with this question. But bitconi doesn't need to be "acknowledged" by countries governments to be worth something.
I know I will be sound awful but if it rains fiat and bitcoin assuming that bitcoin could not be traded to fiat currency, what will you pick?
It wouldn't "rain" bitcoin because that's one of the main reasons why bitcoin is valuable: nobody can just create bitcoin out of thin air because they want to.
If bitcoin wouldn't be able to be traded for fiat, then it means that bitcoin still has little to no value(e.g. bitcoin's early years). But the fact is, bitcoin will ALWAYS be available to be traded, simply because bitcoin actually already has value. The day bitcoin was being bought and sold for cents or fractions of a dollar, was the day it already had value.