Professor Tree

Professor Tree is a supposed professor on Pokémon, but he is probably as competent in Pokémon research as Rusty is in Pokémon battling. He looks identical to the renowned Professor Oak, except for he wears shades. He speaks with a dull, tired voice and is always high on marijuana. That is probably because the requirements for his Pokémon professor career only include counting Pidgeys, as revealed by Professor Tree in The Journey Begins.

Appearances
In The Journey Begins, Rusty delivers a chicken panini to Professor Tree and asks him about his knowledge about Pokémon. Prof. Tree explains that he doesn't know much, but Rusty insists that he sends him on a Pokémon journey anyway. Prof. Tree blindly complies and Rusty grabs a Kakuna from his desk, much to Prof. Tree's surprise, as he didn't even realize that was a Pokémon. In Celadon Mall, Professor Tree arrives in the Celadon Mall when Rusty mounts a bike he just bought, telling him that that "isn't the time to use that". After Rusty leaves, he goes to the cashier and asks for a bike filled with marijuana he requested. When the cashier explains to him that he sold it to a kid, Professor Tree thinks it's funny. Then two Pidgeys fly in, and he flees.

In Pokémon Documentary, Professor Tree is visited by Rusty in an "Herb Shop". He tells him that they're watching a documentary and that there isn't enough snacks for Rusty, but lets him in when he learns that Rusty brought Pringles, a kind of potato chip. During the documentary, he and his friend (who runs the shop) doze off. He is soon wakened by two Pidgeys. He is heard shouting as Rusty leaves, "No! Not the Pringles!".

Trivia

 * Professor Tree is named in parody of Professor Oak, along with many other aspects of his character.
 * The Pidgeys may have some sort of grudge against him, which is why they may be chasing after him