Slope of 2nd order low pass vs band pass Butterworth filters
By convention, the pole count refers to the number of poles in the design polynomial (Butterworth, Chebyshev, etc) and this defines the amount of roll off in the stop band. 

If we maintain this convention, then all filters roll off at the rate of 6 dB / octave / pole in the stop band, whether it is a low pass, high pass, band pass, or notch. 

Also, a nth order Elliptic has the same ultimate roll off rate in the stop band as a nth order Butterworth. Of course, the Elliptic's transition band will be much narrower.