kinda confused now, I thought you couldn't get back to this Wladislauv and the Bandersnatch/Jabberwocky spot after you beat the boss, or is this not the FINAL FINAL boss?
Oh I'm sorry, I thought you meant going to Gran pulse and the king behemoth and all since that was mentioned before. I didn't read well >.<
But yeah you can go back to Gran pulse when you are at that spot, but if you go back to Gran pulse after you reached the next area (the room for the final boss) then you will always reappear there and can't fight the Bandersnatch and Wladislauv anymore. Hope you understand me