Apply to beta 13 or to clean fire red?
Oh.. sorry, I clearly missed the context. If you were talking about the RTC Patch then apply it over your Red Chapter Beta 13 Part 1 ROM.
am I the only person who has caught Volcanion in beta 11e?
No. Volcanion is after the Waterfall near the Power Plant, iirc. I caught it too.
possible bug (maybe feature?)
it is possible to cancel to the evolution of poly whirl during the bonus chapter
what happens if polywhirl is not in your party?
I made a little experiment about it and apparently, if you do that chapter without having a Poliwhirl, you're gonna get some MissingNo. in some of the boxes that your PC has. In my case, I got 2 in the 3rd Box.
I assume that having a Poliwhirl but cancelling the evolution itself would work just fine though.
You would have a Poliwhirl and things would work correctly.