ah that makes sense!
Did you know the Pokémon professors are named after trees!!!
They span several generation and I have no basis not to mention it does not name all the trees
So, it is some coincidence huh???
Trees have no limits or order, whereas the Zodiac does.
We do not know the number of species of trees. Ergo, an unknown number. There are only 12 animals in the chinese zodiac(I think).
They're based on other origins. Not every Dragon is a reference to the zodiac whereas Charizard (presumably) is.