Sorry my mistake, I was thinking of how Magby is exclusive to Black 2 and Elekid in White 2, all three (including Growlithe) are found in the Virbank Complex so I confused myself. In that case I would choose Growlithe as I found him really useful. I held out to get Outrage and Flare Blitz before evolving which was a bit of a drag but not too bad, he beat Drayden with 1pp of Outrage.
And Accelgor > Escavalier imo as it has ultra speed so can quickly kill what you need it to. I've found Escavalier takes too many hits and needs to get healed more often is all.
But anyway it looks like you've already chosen your team and I've gotta say it does look fun. Hope you enjoy your playthrough!
EDIT: oh man looking back I did mess up who evolves into what. Whoops
gotta stick to your macros if you wanna mack hoes