Professor Ivy was the Orange Islands' professor, and the Orange Islands were only seen in the anime.
And it's all right to have a Professor Pine if that's what you want. I was just pointing out that for a lot of the experienced writers in this fandom, Professor Pines are everywhere.
Oh...
Wow.
I never really even read any fanfics :P
I couldn't think of any other tree that would actually sound decent.
"Professor Christmas"
Not a good tree :P
Ah, well, I'm fine with simple ol' pine.
But...
Ivy was the anime's invention?
When did they mention an Ivy?
Yes, but nearly every time a writer needs a professor, the name chosen is "Professor Pine". It happened so many times in the past that it's just a big joke to most of the fandom's writers.
By the way, there's also Professor Elm, the Johto professor. Ivy was the anime's invention, but Elm is everywhere.