Ninthwave,
When Pugs first started, it didn't have any support for Parrot. With that said, all of the Perl6 functionality that is in Pugs today, with the exception of rules which requires PGE, doesn't require Parrot. Just having Parrot in your path will enable rule support from what I understand.

Targeting Parrot is a work in progress but there is minimal capability through -BParrot (pugs -BParrot examples/mandel.p6). There is more robust support using -BPIR but as I said, it is an evolving process. How to use the compreg thingy in Parrot to eval p6 code is beyond me, but I know it is in there.

Hopefully autrijus and/or chip will augment my reply as I don't know what document(s) to point you to.