I wonder if this is an exhibition match, and therefore to a greater extent a contractual match, then how in this case you can bet on it, because this is manipulation and insider in its purest form and relying on Pacquiao's skill here is very reckless.
It's very obvious that bookies will not list this fight due to the fact that it's an exhibition match and there's no flame between the participants.
If ever you will see bookies that will cover this match, then think twice before placing your bet as it might play you instead.
Besides, why place a bet on exhibition matches where there are thousands of other options to place your bet.