You know, I have a suggestion (after reading said VM chat between you and princess). If Warren does win (which he won't), Sam makes him promise something. Sam's too emo to really give a damn whether he loses or not, so he makes Warren promise him something.
"Hahaha...good job, Warren," Sam said, laughing quietly. Warren rolled his eyes.
"It wasn't really hard, though. I don't see why you're surprised."
"Eh. Anyway, in more serious tone, I've got a favor to ask of you."
"What the hell do you want? I'm busy..."
"Some day soon...the darkness within me will become too much for me to control...I want you to stop me, no matter what it takes."
"Dude, you sounded really retarded right there."
"I'm serious, though. If I do go out of control...stop me however you have to..."
"Yeah yeah...whatever..."
"Thanks...now, back to the party..."
Also, the idea of Warren getting back to his roots...sounds interesting. Hoenn's more of a OMG Sam's evil region. The dark side takes over for like...a really long time after a certain point. I suggest Sam fight either Jazmine (princess's new character) or Warren...it just fits.