... one day, as I sit on a chair in the Pokémon Center, I feel a pinch. Turning to my chair, I notice that a tack has been placed on my chair. Suddenly, Youngster Joey pops out of a turkey sitting to my right, and begins to talk.
He says that through the tack he has infected me, the only one to have ever defeated his top percentage Ratatta, with Clair's DNA . He says that it will manifest in my own genetics, slowly transforming me bit by bit, down to the way my mind thinks, into Clair, an irreversible condition.
First, I palm the tack and pretend to offer a congratulatory handshake to him. Of course, he falls for my plot, as he ends up getting stabbed by the same tack as a result.
After I explain what I did, I laugh, and stab myself with a similar tack that contains my own unaltered DNA (which I have stored in my gear in the case of an emergency). I then run away before Joey can stab me with the original tack again.