Battle Fucker in Ilias Port University 3F.
In order to access the university's third floor, you must have done the Elficilin side quest. A quick summary: complete the second tartarus, go to Enrika, talk to Micaela's door guard after speaking to the elf inside, talk to the dark elf in the item shop, fetch and return Healing shell from Lemuse Beach, then bring the Elficilin she rewards you with to the Doctor on the second floor of the university.
Fizz does 301 damage and gives Diploma upon victory.
"I'm busy writing a paper right now..."