The teen, who's name was revealed to be Mark, walked to Prof. Oak's lab.
'I wonder what Pokemon I'll choose.' Mark thought to himself.
Your choices for a starter Pokemon in Kanto were Bulbasaur, Charmander and Squirtle.
'Considering the type of Pokemon the first two gym leaders use, I'll choose Bulbasaur as my starter as it's type would be super-effective against them.' He thought out loud.
Mark eventually made it to Prof. Oak's lab which was located on the southern end of town and rang the door bell. The professor then came to the door.
"Hello Mark. What can I do for you?" He asked.
"I'd like a starter Pokemon." Mark politely responded.