ArisKatsaris comments on Harry Potter and the Methods of Rationality discussion thread, part 5 - Less Wrong
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How did Sirius manage to switch with Peter?
With Harry thinking the best way to break out of Askaban not to be sent there in the first place when he first hears about Sirius, the Quibbler story that Sirius and Peter are secretly the same person and someone Fawkes is particularly unwilling to leave in their Askaban prison cell mumbling "I'm not Sirius" over and over I have very little doubt that it somehow happened. I see no way to show that all just to have been a red herring that's even the least bit awesome. And then it has also repeatedly been mentioned that there seems to have been no reason for Sirus to search out Peter on that day and been made abundantly clear that those events did not transpire as in canon.
So how did he manage it?
Just forcing Polyjuice down Peter's throat doesn't seem like it would be enough since it's limited to one hour. Maybe Peter is a metamorphmagus (or human-form animagus or something) and Sirius imperiused or otherwise mode-locked him? If there was a way to trade bodies I think it would have been hinted at by now.
If Sirius is innocent, and Dumbledore knew it but couldn't prove it, then the swap could have been done by Dumbledore, replacing some other Deatheater (not necessarily Peter) with him.
Goblet of Fire (and Barty Crouch Jr's escape after swapping with his mother) shows us that Dementors are okay with you bringing in a fresh victim to trade for a less fresh one.
That would be possible, but doesn't match the hints. Sirius would have been in Askaban, it wouldn't explain the confrontation, and the scene with Fawkes would be out of place if Dumbledore knew.