Honestly, as ridiculous as it sounds, I'd say this is not even impossible. If we assume that the version of Valuev that faced Holyfield shows up, the one who refused to throw punches for the first six rounds, I guess Pac would have a small chance. He'd have a chance if he runs all night long and is content landing a few ineffective body shots on the inactive Valuev, just enough to win some rounds - he could squeeze out a narrow decision then. Valuev is so slow, I think he might not catch Pacquio for a full 12 rounds. Valuev has absolutely no inside fighting skills, still I'd advise Pacquiao to stay well away from him. If the version of Valuev that beat up Lyakhovich shows up, I don't see a chance for Pac. If Valuev catches him, it's over.
Pac would school Valuev, no bull****....even though Valuev could probabbly KO Pac with a jab, i can guarantee he wouldn't land 1 punch the whole fight, and that Pac wouldn't miss as much as once Pac by shutout