depends on the moveset, in UU it was mostly Eruption/Flamethrower/hiddenpower/focusblast
ye maybe it will get used in NU since there are mons like golbat,haryi and poliwrath ,
i really doubt people gonna use extransen tho since flamethrower is like a must (with strock on the field 24/7 u cant use eruption alot)
Hiddenpower rock or grass for mantine, poli (maybe rhydon as well if ppl dont want to risk fblast) their biggest fear has to be Mantine so hp rock is alot considerd
Focusblast for mons like munchlax, Clefable, i guess houndoom as well.
so yeah it really depends on the moveset and yea frillish gonna be #1 in this tier since azu and typ are down haha