Last game I played happened to be Dead Rising 2...
THANK GOD THE LAST THING I DEFEATED WAS SLAPPY

Oh that was close cut there. I didn't kill any zombies afterwards as I was carrying a survivor, and I've never been happier to have a damn escort mission as i am now XD
And the guitar to my left SHOULD help as I know Jonathon Coulton songs (RE:RE:Your brains). All I need to do is distract them with awesome tunes whilst Slappy mows them down.
Pokemon though? I was very tempted to say Psyduck due to the whole ALREADY IN EXTREME HEAD PAIN situation, but I don't think so.
I'm gonna go with something that is practical as a pet, fast and agile,awesome and is a fire-type (Flamethrowers being the best against ZOMBIES!!!)
9 Tails, hands down. Rapidash maybe, if I didn't hate horses (One of those damn things tried to throw me off a cliff) and it would be impossible to ride without crotch burns.
And Charizard no because it is just as likely to kill me as it is a zombie.