Opponent Greninja Protean sometimes does not activate

[Aezer 0]

Currently around level 40-45; I was grinding against Hotshot Fawkes in the Grand Hall, and noticed that sometimes his Greninja would not change types(specifically, my cherrim's petal dance was super effective after greninja used feint attack). This does not happen when I heal at PC between battles, but it has happened a couple times when I fight him more than once in succession without healing.

[Gastronely 92]

That's because you don't battle the same Pokemon two times. Everything, (except the moves, the EV'S, the IV's, and the items) is randomized at the start of the battle, be it, Nature, Gender ot Ability, those always change after each battle, so it's possible that, sometimes, you were battling a Torrent Greninja, and other times you were battling a Protean Greninja.

Edited June 14 by Gastronely