The Abyssal Cult grunt's pokemon are all called False
This is the second fight, at the ruins, and they are called 'false' specifically (lower case f).
It also happens in the rival fight in Metchi town, but only some of the pokemon. Quilava, for one, but not [the special one].
Makes the fights even harder (I'm already on hard mode) when it only says, "x is about to send out false, will you change pokemon?" "uhh... sure?"