The false prophet is Eevee/Flareon. After beating Erica (4th gym), the game really opens up and there are numerous way to approach the second half. Basically there was only one spot available for another pokemon, and using the PC is basically out of the question due to the difficulty of actually depositing/withdrawing the correct pokemon, and the chance of releasing one of our main guys.
So the obvious choice was too get Lapras from the Silph building right? No use of pokeballs, no having to fiddle with the PC, and it fulfills our need for a Surf/Strength user.
But nothing is that easy. The Eevee worshipers won the war and got to the top of the building where Eevee is given to you. In addition to wasting Lapras's spot, this created the new dilemma of actually buying a thunder/water stone, and somehow using it on Eevee.
Of course the money is wasted on a firestone, and in the midst of trying to deposit a weaker pokemon to make way for Lapras, we deposit and release our starter Charmeleon (Abby) and our trusted Ratata (Jay Leno).
Miraculously the stone was successfully used on Eevee though, so we're stuck with Flareon. The false prophet who caused all of this.