The Route before Victory Road. Sorry if that is not too informative. But I hope this helps anyway. :)
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What is a "rufflet?" a Pokemon... Black or white????
If you haven't encountered it then there is a possibility that it might not have a Trainer with a Rufflet. This fact might support the question: "Rufflet is exclusive to Pokemon White Version. And Vullaby is exclusive to Pokemon Black Version."
it evolves at level 54
A trainer in route 23 has a rufflet
Rufflet (Pre-Evolution of Braviary) is only available on Pokemon White Version