This regionals is really crucial and almost make it or break it for me.
That being said...
Yeti- too predictable, exploitable, and UBER popular (Ben also suggested this)
DarkGarb- maybe, once I steal Prams list
Raticate- lololol dumb
Palkia- red signal is in every deck I expect to see. That is, primarily VirGen and Yeti.
Twinjask- same