Lol. Mr. Rose? That's the stup.... not very smartest hypothesis I've ever heard.
Their last names haven't been rvealed. Se we can't draw up an answer at the moment.
I KNOW! We need a female Professor! One named after a poisonous plant because of purple hair! And maybe she would've fit better a long time ago like... the Orange Islands!
She would look so hawt, Brock would go lose his virginity and get replaced by some guy that loves to finger paint...
Oh wait...
Dont forget, Brock's last name is Flint. =3=
Some of the last names are...hmm...I do love the fact that the professors are all trees.
There needs to be a female professor....Professor Heather...or something.
I think Ash Ketchum & Tracey Sketchit are the only names of main characters that have been mentioned.
Oh, and Gary, but his is obvious anyway, since he's related to Professor Oak.
So, they don't really have last names.
Gary has a last name only because of his grandfather anyway, and of course, it would be unnatural for a professor to be called Prof. [insert first name]. Hardly anyone has a (revealed) last name in the show.In Japanese, not even Ash has a surname o.O Gary does and, for some odd reason, Giselle.
And, of course, all the professors.