Flammy has only 1 mode, but it also has only 1 2h attack - the rightswing (which makes it the only usefull attack on the flamb with more than 200 range, so you actually can outrange bamboo spears, Long awlpikes and greatsword stabs with it).
Stab, Overhead and leftswing on the Flamberge use polearm animation, but all 4 attacks use 2h WPF. But actually the only attack you really use as flamberger is the rightswing, since every other direction sucks compared to it.