How to get PROF. OAK in Pokemon Red.
1) Start a new game (Sorry, people)
2) Do everything until you get to choosing a pokemon, but don't choose one.
3) Move down an exceesive amount of time through the bookcase.
4) The game should glitch and you and PROF. OAK will dissappear.
5) Talk to where PROF. OAK should be, you will walk down through the bookcase.
6) Leave PROF. OAK's lab.
7) Walk into the grass, and PROF OAK will appear.
8) Use a master Ball on him, if you use a normal pokeball, this will happen
9) Capture OAK, and you can use him in battle!